ok, ive just read in more detail whats been said.
All you could try is sit them down and talk too them. Dont question theyre beliefs, Just say you want too take some time out, Take a step back from the religion, And that if they keep forcing you too go it will not solve anything, If anything it could turn you atheist (i would know).
When it happened too me i was in a fortunate position, I live with my mum who is a devout jehovahs witness, But i had the option too go and live with my dad if she kicked me out, but she never did.
Me & my mum are as close as we've ever been, Just dont take the piss with it.
And step-dad's are arseholes. Just remember - 1, He's not your dad & 2, Your not his son.
Let him know that respect is earned, not given.