God so loved the whole world, he sent his son to die for them.  But, God gives the privilege to only those, who separate themselves from unrighteous world, to become his sons and daughters . "2 Cor 6:14.  --- what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?--- 17.Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you, 18. And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty." So, God wants his people to stand for righteousness and not for tolerance.

In the Garden of Eden Satan deceived Eve with cunning ingenuity. "Gen 3:4 And the serpent said unto the woman, Ye shall not surely die:" Then with elusiveness Eve deceived her own beloved husband without knowing what she was doing. "Gen 3:6 ---, she took of the fruit thereof, and did eat, and gave also unto her husband with her; and he did eat."  Even today, Satan deceives his followers and they in turn deceive other people. Same as Eve deceived Adam; most of these people deceive their own loved ones without knowing what they are doing. 

Satan told Eve that they will not die. He also said that they will become like God if they disobey him.  Even now the false preachers are doing the same thing.  They are preaching to the people that they are saved from hell (meaning that they will not be punished, or they will not die a spiritual death), while they continue to live in sin (disobedience to God). 

They misinterpret the meaning of grace as a special privilege which is given to those who claim the name of Jesus Christ for their salvation.  But the grace of God is given to the obedient believers in order to overcome sin. Grace is the power of Lord Jesus Christ that rest upon a believer in order to strengthen him/her at the weak point of the believer. "2 Cor 12:9 And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me." But the grace of God is neither a license to continue in sin nor a guarantee of admission to heaven. 

They are false workers come under the pretence of good godly workers. "2 Cor 11:13 For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ. 14 And no marvel; for Satan himself is transformed into an angel of light. 15 Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works."  Some of them are possessed by Satan.  They purposely twist the Word of God and lie to the people as Satan lied to Eve. Some of them are like Eve, without knowing they serve the cause of Satan. God says that their end will be destruction. 

They do not know "the Salvation according to the Bible."  They preach false deceptive salvation. "2 Pet 2:18 For when they speak great swelling words of vanity, they allure through the lusts of the flesh, through much wantonness, those that were clean escaped from them who live in error. 19 While they promise them liberty, they themselves are the servants of corruption: for of whom a man is overcome, of the same is he brought in bondage."

Take a good sermon of your favorite preacher.  Take a sermon of Jesus Christ.  You may take a portion of the sermon of the mount or any one of his other teachings from the Bible.  Compare the sermons.  If the purpose and concept of the sermons are geared in the same direction, then you have a good preacher.  If there is discord then you have a false preacher.  

From Genesis to revelation almost all the books warns about false workers.  Outwardly they serve God.  But inwardly they serve mammon (the things of the world, for their belly) or they serve Satan.  However, they are planted by Satan in the field of God, the Church world. They are counterfeit and are false workers.  Even though such caution is given to us through out the Bible, the Christians are generally very silent about it. The true servants of God are in the midst of them.  "Matt 13:24 Another parable put he forth unto them, saying, The kingdom of heaven is likened unto a man which he sowed good seed in his field: 25 But while men slept, his enemy came and sowed tares among the wheat, and went his way. 26 But when the blades were sprung up, and brought forth fruit, then appeared the tares also. 27 So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in the field? from whence then hath it tares? 28 He said unto them, An enemy hath done this."  If Satan has placed his people as ministers in the Church world, it is not a big surprise that these ministers will not caution about the false workers.  Some of them caution about someone else in order to hide the fact they themselves are false.  Those who preach clever lies by twisting the Bible in order to sugarcoat sin, are of Satan.

"Matt 7:15 Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves. 16 Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? 17 Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit."  This is one of the warnings of Jesus Christ regarding false workers.  Outwardly they appear to be very enthusiastic workers of God. Jesus cautions us to look at the fruits they produce.  Those who preach the same message as Jesus Christ preached, bring good fruits as Jesus Christ has brought.  All others bring evil fruits of lies from the devil.  "John 15:4 Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me."  Jesus asks his disciples to abide in him and have Jesus abide in them.  In the Christian world, the statement 'Jesus lives in my heart' became the saying of everybody.  But in another couple of verses Christ says, "John 15:7 If ye abide in me, and my words abide in you,--."  That is, if Jesus Christ abides in us then his words will abide in us.  Then what he had preached and taught will come through our mouth.  Even in life, we will produce the same fruit that Jesus Christ produced.  Jesus Christ was calling people to righteousness and holiness so that they may be of the children of the Father in heaven.  Those who do not produce this fruit that Jesus has produced are not of his.

I personally know a few sick people who desperately needed healing.  They went to Church after Church and healing crusade after healing crusade in order to be healed.  They were looking for celebrity power healers.  They were looking up to so called men of God, who had various kinds of miracle manifestations.  Some of them hiss like a serpent, roar like a lion, etc.  Some of them prophesy great things. Some fell people down with the breath of their mouth and by the sift of their jacket. They preach strange doctrines, which are different from the preaching of Jesus Christ.  But they were all false workers and are deceiving people.  All their works will be revealed in the final day.  "Matt 7:21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven. 22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works? 23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity. 24 Therefore whosoever heareth these sayings of mine, and doeth them, I will liken him unto a wise man, which built his house upon a rock:"

Prayerfully find out what you are; by the things you do (even in your private life) and from the messages you preach, whether you do the same things that Jesus Christ has done and preach the same kind of messages that Jesus Christ preached.  If the answer is yes, then you are placed by God in His Church.  Continue to do the faithful work.  If your life and your sermons contradict from that of Jesus Christ, then it is time for you to repent.  You don't want to be another Judas Iscariot.  "Heb 10:31 It is a fearful thing to fall into the hands of the living God."

Continue to study and obey the word of God prayerfully.  "John 8:31 Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed; 32 And ye shall know the truth, and the truth shall make you free."  Trust God faithfully.  Believe the word of God.  If you obey Jesus, you will become a child of God and he will give his grace and power to you. He will make it a glorious beginning and will take care of you until the end.  Beware of false workers.  "Phil 1:6 Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ:  Matt 7:15 Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves."