A 757 was flying from New York to England; packed out with passengers. Suddenly, the pilot comes over the PA system saying:

“The co-pilot and I have been speaking. He believes this plane will also double as a submarine. I wasn’t too sure but he is very sincere in his belief that it can be done. So, we would like to give it a try”

Does the sincerity of a person mean they are right? Does it mean it’s ok to do a thing, just because we are sincere? Saul of Tarsus was very sincere in his service of the God of Abraham; yet he ended up being against Him.

The only way we know we are right is by a study of God’s Word, doing what He says in it, and gathering into the kingdom.
Luke 11:23 (KJV) 23 He that is not with me is against me: and he that gathereth not with me scattereth.