Text:“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? He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up? But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them….” - Matthew 13:27-30
As the children of God we should be tolerant in dealing with unbelievers or people of other faiths. This point is clearly made in the parable of the wheat and tares in which our Lord Jesus Christ likened the kingdom of God to a man who sowed good seeds in his field. “But while men slept, his enemy came and sowed tares among the wheat, and went his way. But when the blade was sprung up, and brought forth fruit, then appeared the tares also.” The fact is that before the final end of this evil world, both the good (the sheep) and the bad (the goats) should live together in peace. Hence the parable states further, “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.”
Though there would be wicked people in God's Organisation, that does not make the organisation to be defiled or false. (Jeremiah 5:26) The only thing is that those given to righteousness should not follow the pernicious ways of such wicked people but continue in righteousness for their own salvation. – Exodus 23:2; 1 Corinthians 15:33,34; 1 John 2:15-17.