Let's see exactly what people are holding so firmly to, while all the time believing they aren't actually deluded.
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First, let's take a quick look at the basic biblical narrative:
There is an indescribably powerful and intelligent being called God who is in existence prior to the dawn of time. For whatever reason, he decides to create the universe and pays particular attention to planet Earth. Having created the universe, Earth and all the species on it (through 'creating' the Big Bang and 'guiding' evolution in the Williams style of interpretation), he decides to focus all his attention on a collection of tribal groupings in the Middle East, in particular the Israelites who are his 'chosen people' and who he obsesses over, while apparently ignoring the rest of the world's population. He lays down numerous often primitive and arbitrary moral and ceremonial laws, then gets involved in inner tribal politics and land disputes, inciting acts of brutality, war crimes, genocide, and rape along the way. Fast forward to the Middle East under Roman occupation and God decides it's time to put in an appearance. By mystical means he comes to earth in human form, being born of a virgin. He becomes incarnate as a Jewish male and wanders around what is today Israel-Palestine, imparting pithy social commentary (but never giving any systematic explanation of how such ideas might be made politically useful), engaging in faith healing (removing 'demons' from people), magic tricks (such as walking on water and raising a dead man), and ranting on and on about sin, eternal punishment for the majority of the world's population, and the impending end of the world. He gets himself crucified, in order that he can sacrifice himself to himself for our good. A few days later he walks out of his tomb and wanders round with some of his followers (noticeably not bothering to make himself known to anyone but those who already believed in him), before 'ascending' into 'Heaven', to wait for the time when he will return to raise every human who has ever lived in bodily form for judgement, then cast most of us into a pit of fire and take a select few into his 'kingdom' for eternity where they will live happily ever after.
These are the basic building blocks upon which all Christian theology is constructed. Williams and others can protest that of course they don't really see things in such a simplistic and manifestly implausible way, but this narrative underpins the Bible, the Church creeds, liturgies, and centuries of theological speculation.
It doesn't look so impressive when you break it down. But there it is, that's what Christians believe. And quite a few of them don't even believe in evolution or the big bang! Shall we all respect these beliefs? Nah, I don't think so. If you think we should, you should look over what they actually believe again until you can no longer read it with a straight face.