Teaching right from wrong is the church's responsibility (and parents). Calling sin by its right name is paramount. Instructing members to learn how best to study God's word, and to share their faith with others, vital. But to begin to take upon ourselves the role of changing people's hearts and minds, is stepping over the line. Encouraging people to obey God is one thing...encouraging people to obey us is another matter entirely, and is a sure way to establishing a cult.
"The first step of apostasy is to set up a creed, telling us what we shall believe.
The second is, to make that creed a test of fellowship.
The third is to try members by that creed.
The forth to denounce as heretics those who do not believe that creed.
And fifth, to commence persecution against such." J. N Loughborough
Matthew 13:24 ¶ Another parable put he forth unto them, saying, The kingdom of heaven is likened unto a man which 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 blade was 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 thy field? from whence then hath it tares?
28 He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up?
29 But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them.
30 Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn.
Luke 9:51 ¶ And it came to pass, when the time was come that he should be received up, he stedfastly set his face to go to Jerusalem,
52 And sent messengers before his face: and they went, and entered into a village of the Samaritans, to make ready for him.
53 And they did not receive him, because his face was as though he would go to Jerusalem.
54 And when his disciples James and John saw this, they said, Lord, wilt thou that we command fire to come down from heaven, and consume them, even as Elias did?
55 But he turned, and rebuked them, and said, Ye know not what manner of spirit ye are of.
56 For the Son of man is not come to destroy men’s lives, but to save them. And they went to another village.
In our legalistic self-righteous finger-pointing attitude to those among us that we observe aren't measuring up to our own "impeccable standard" we can do every bit as much damage to people new to the faith, or those not yet fully committed, as those disciples sought to do to those unbelieving Samaritans.