Theistic beliefs are not rationally justified

[futureboy]

to your diqualification of parental teaching- I see no reason to justify the prejudice against parents as proper authority to derive beliefs from

I'll focus on this, for now. I'm of the opinion that accepting a claim because an authority tells you it's true (or simply tells you to accept the claim), does not rationally justify the belief. Sure, you could say it justifies the belief for the authority, and even for you, and the claim may even turn out to be correct, but none of that qualifies as rational justification for believing the claim.

On what basis do you say that coming from an authority serves as rational justification for belief in a claim, since this is clearly not a reliable pathway to truth?