Strong claims require strong evidence. Some book written by many, some properly delusional or crazy folks, claiming various outlandish things not physically possible these days (staying away from word "lies" but not too far, basic physics laws worked the same 2000 years ago).
Or preaching behavior absolutely unacceptable these days (Old testament would force you to be murderer pretty quickly nowadays, and I haven't heard a single Christian rejecting all of it... they can't so just they ignore most of it like it doesn't exist). All this decades and centuries after claimed facts, that ain't a proof in any sense. You can believe it for sure, I can choose to believe in Great Spaghetti Monster and its holy teachings and its about the same.
There are no contemporary roman records from that time, earliest (with both eyes squinted and a lot of wishful thinking) is more than century afterwards. Quite an impressive record for claimed son of God, or God himself or whatever it should be.
I've been reading a bit about various sects recently, today it was Jim Jones and his escapades. With enough steps back, it all looks exactly the same, including behavior of believers. To the very last bolt. Tells you a lot about humans and how they internally try to handle tough times, but not much else.
So please, lets have a more rational discussion rather than level our grandparents may consider passable but many of us don't.