It's so good to see discussions forwarded with references to God's word! Not tradition, opinion, feelings, or polling data. So glad there is still some salt with a seasoning effect. Unfortunately (or maybe fortunately) Paul also acknowledged that for now we see with shadows. I'm so glad there is One who knows the future, and we are in His hands. Another reason to give thanks.
I'm convinced that the doubters have witnessed and studied the improper practices that are obviously off the Word instead of trying to understand what the Word says.
When one approaches any subject in the Bible with a view to disprove it, then there is inherrent disbelief. They don't believe, therefore they don't see and thus they misuse scripture to justify their disbelief.
They can never say they weren't given an opportunity to know about it. They were and rejected it.