PREACH THE WORD
"Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine." 2 Timothy 4:2
It is always the season to correct error in the church! (First, we must not be doing the same thing ourselves) Then, we use the truth of the scriptures. That is HOW we love our neighbor as thyself:
Leviticus 19:17 Thou shalt not hate thy brother in thine heart: thou shalt in any wise rebuke thy neighbour, and not suffer sin upon him.
Leviticus 19:18 Thou shalt not avenge, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am the LORD.
Christians are not to judge the world --God does that; but we must judge sin in the church and cast out of the church anyone who refuses to be corrected.
1 Corinthians 5:11 But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat.
1 Corinthians 5:12 For what have I to do to judge them also that are without? do not ye judge them that are within?
1 Corinthians 5:13 But them that are without God judgeth. Therefore put away from among yourselves that wicked person.