Jesus prayed for unity in his church in John 17:21-22. The denominational division and unity through diversity movements are against the New Testament pattern. God wants his people to be of the same mind and to understand his Word alike, Eph. 4:3-6.
No question is more important than this. We make many important decisions in life regarding matters such as education, marriage, and occupation. But none is as transcending as that which affects our soul's eternity (Matt. 16:26).

"Then He said to them all, “If anyone desires to come after Me, let him deny himself, and take up his cross daily, and follow Me. For whoever desires to save his life will lose it, but whoever loses his life for My sake will save it. For what profit is it to a man if he gains the whole world, and is himself destroyed or lost?"
Luke 9:23-25