Hi designs
the instructions against division making and causing controversies are biblical.
1 Corinthians 1:10
I appeal to you, brothers, in the name of our Lord Jesus Christ, that all of you agree with one another so that there may be no divisions among you and that you may be perfectly united in mind and thought.
1 Timothy 6:3-5 (New International Version)
3 If anyone teaches false doctrines and does not agree to the sound instruction of our Lord Jesus Christ and to godly teaching, 4 he is conceited and understands nothing. He has an unhealthy interest in controversies and quarrels about words that result in envy, strife, malicious talk, evil suspicions 5 and constant friction between men of corrupt mind, who have been robbed of the truth and who think that godliness is a means to financial gain. Christendom is heading towards an unbiblical ecumenicalism of today, which tells us to forget all doctrine for sake of unity. They use Jesus as a talisman not a bringer of a life-saving message we then live by in harmony with already established Bible truths.