I don't think these things are true, that because Jesus is important to believers, then non-believers have to apply extraordinary principles of analysis. Because Jesus is not important to non-believers who accept the evidence as sufficient to indicate a probability that he existed.
It is not accepted by me that the "bible" is a single uniform source of deceit, let alone a proven one. Though it has deceitful passages within it, in all probability. Untruth is not necessarily deceit. Ignorance or delusion can also produce untruth.
Oh, I think the preaching of Paul and others probably was only from ignorance and delusion. But it's still deceiving the listeners and the converted into believing something which was manifestly (to us now with 21st century education) untrue.
And more importantly, it's still to this day acting as a deceit, i.e. deceiving gullible Christian believers today who think the bible stories must be true ... either literally word-for-word, or even as in this very thread, believing as a matter of incredulity that there must surely have been some basic truth there about a real Jesus ... well that is a huge howler of a mistake - because there certainly does NOT need to be any truth in that biblical writing about anyone named Jesus.
In fact on the contrary, all the evidence that we now have from 21st century education, and particularly from any decent level of scientific education, should alert you to the fact that there is nothing in the biblical stories that is actually evidence of a real Jesus in any sense whatsoever.
On the complete contrary, what is said about Jesus in the bible is manifestly and most certainly NOT true. It is very obviously a superstitious religious fiction, which has clearly been shown to be taken from beliefs ion the OT.
But as I have emphasised at least 40 or 50 times here (literally!) - that is not to say Jesus was impossible. He might have existed. Anyone might have existed. And it certainly seems that there were lots of messianic OT Jewish preachers around Palestine in the 1st century.
But the problem is that the only stories of Jesus (the biblical stories) are most definitely complete and continuous fiction in almost every significant mention they ever make of Jesus. So that much is certainly not true.
And against that, we now know that fictitious stories of very similar religious belief were always told in every one of the many hundreds (if not thousands) of religious sects of that time … from the Christianity of Jesus to all of the various influences of Greek, Persian and Roman gods and deities that are now known to have pervaded belief, custom, education and all manner of life in that region.