it might not feel absurdly high because absuridty is often a heuristic about what should be laughed at rather than what is unlikely. When people say something is absurd they mean it should be laughed at along with its claimer.
5% is a "respectable" estimate except perhaps in some very untheist countries. (I don't know and am too lazy to look it up is why I am saying perhaps, not because I know and want to make the fact seem small.)
The other difference I see between old norse paganism and religion is that there are all sorts of people who don't otherwise appear to be crazy who say christianity is true and you can't properly internalise the idea that they are all wrong/lying.
Oh and this just occured to me. It could be you are sort of/on some level afraid of hell. You may have had the idea of someone being wrong, in contravention to" popular wisdom raised to your attention and be unconciously avoiding conclusions that leave you in that scenario especially when the punishment for being wrong is hell.
The question that stopped me thinking christianity, while unlikely, was unlikelier than the other religions was was: If you were raised by old norse pagan/aztec/muslim/hindu parents in an old norse pagan/etc place do you think you would have a higher instinctive estimate of its probability?
Another thing to consider is that the people telling you that Jesus is a resurrected God say all kinds of other stupid stuff which is probably untrue (so p(christianity in general) is low for that reason and the probability that Jesus is a resurrected God goes way down if christianity is not true otherwise. Also, christians are in fact, on further inspection, generally visibly crazy, for a relevantly/appropriately strict definition of sane and present as their evidence a book that it has somehow become doctrine is God's word despite being tampered with by humans all the time.
A friend recently asked how strongly I believe that my deconversion from Christianity was not a mistake. Here's my response, and for those of you who are not Christians, I'm just wondering what numbers you would give:
"There is a part of me that wants to say the chance is far less than 1 percent. But when I consider what 1% must mean about my ability to follow complex arguments and base my judgement on the right premises, it seems absurd to say that.
Trying to honestly estimate the chance that I'm wrong about the Bible being generally reliable is a fascinating exercise... I know the number is low, but I'm not sure how low.
Today I would give myself a 1 in 20 chance of being wrong. If I were to consider the arguments of 20 other groups similar to Christian theologians, I would probably misunderstand them at least 1 time in 20. After talking with 20 groups that have a very different worldview, I might think they are all are mistaken, but once in a while, maybe 5% of the time, it would actually be me.
Wow, 5%!?! If I convert that into "There is a 5% probability that the God of the Bible exists and will send me to hell", I feel scared. But I know how to cheer myself up: I just say, "No way, the chance I'll end up in hell MUST be less than 5%. After all, the God of the Bible is CLEARLY just a big, mean alpha-monkey and... [rehearse all the atheistic arguments here]".
This back-and-forth from certainty to uncertainty makes me feel like I'm doing something seriously wrong.
So what about you? What chance do you place on some variant of Christianity turning up to be true, and what chance do you think a god of some sort exists?"
Numbers please.