My original understanding were secular sources within the first 100 years of the 60 AD time period where Nero went wild. Looking up specifically who I was surprised to come across basically most of the known history (I was expecting to see Nero & all the other stuff but I don't know why there are Christians are Anti-Semites to suggest it wasn't the Jews but came across bible passages that seem to be contradicted itself but while many Christian sects preach that Jesus died for our sins, those bible passages mentions the King of the Jews title.
Based on the time period there were Christians during Jesus, I don't really know who is responsible for a lot of the super natural claims such as the divine connection, a lot of what I've seen during Christianity is a lot of the major schisms took place during oppression. There was class warfare going on -- I have to research more of who was what when.
To me, I really have no idea what is out there but I figure with the other 2 major Abrahamic sects + the Mormons that believe in the same god & I'm not sure if my timelines are correct -- Quran came after the bible as obvious both Jewish & Christian scriptures influenced it but not sure how long that sect was around possibly before the holy book but isn't Judaism the first one. Probably stupid questions as I should research more but to me it seems like somehow they learned of the existence from one sect & beliefs & practices (they really are closer than far apart on general things) the sects are treated as independent of each other but I tend to think the schisms there happened under oppression. Bible certainly has scripture on that but the Christianity major sect splits which I'm somewhat familiar to the Reformation generally were under other Christians they were oppressed under so they came up with a new sect that varied on beliefs & practices. It becomes confusing for me.
You made better sense of the "Jews killed Jesus" logic.
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