ACTFTU: your reference to Jonah, puts an interesting spin on your questions, for the account is clearly fictional, requiring the violation of nature's laws. But Jonah was conned into proclaiming a message that was meaningless, without teeths, a false prophecy. A set up for his being used , discredited, and kicked to the curb so to speak. His initial refusal seem to have been the right move.
It is but a story, even if Jesus endorsed it. so:
Nice of you being sincere, but with that understanding, what to make of these "what if" questions?
wt is wrong to limit the partaking to the already anointed. The new covenant is a mere prelude, the induction into spiritual Israel, the 12 tribes, having their "sins" forgiven, out of which the 144k are sealed , anonymously. to rule with Christ (if true)
If there is a creator, with even a smitchens of what the bible indicates about him, any of our invented stories, will pale in to nothing, compared what the future experience would be like (if any). Accepting or not the dictates of a provenly wrong "church" would matter little imho. Your doubting might earn you points of approval. How could you rule the cosmos if you are gullible?
If in doubt, follow your conscience and plead sincerity.
commenting not endorsing.