Bart Ehrman is a historian of the Bible. He has many videos on youtube and has written many books about various aspects of the way Christianity developed. The latest that I read was How Jesus Became God, which describes the evolution of the theology of the trinity.
This book covers it in great detail.
Basically, the more distant the gospels were from Jesus, the move divine he becomes. Originally he was just a really awesome dude, then he was divine, then he became god himself.
He goes from "My god, why have you forsaken me" (rather an odd thing to say to yourself about yourself) to "It is finished!"
There's a lot more than that, but basically early christianity went from a low christology (where he was a man) to a high Christology, where he was God. These changes are reflected in Bible.
Of course I have troubles with evidence for god let alone the concept of Jesus. Especially since I discovered the writings of Bart Ehrman…here is his bio blurb and link on Amazon:
Bart D. Ehrman is the author of more than twenty books, including the New York Times bestselling Misquoting Jesus and God's Problem. Ehrman is the James A. Gray Distinguished Professor of Religious Studies at the University of North Carolina, Chapel Hill, and is a leading authority on the Bible and the life of Jesus. He has been featured in Time and has appeared on Dateline NBC, The Daily Show with Jon Stewart, CNN, the History Channel, major NPR shows, and other top media outlets. He lives in Durham, N.C.
https://www.amazon.com/Bart-D-Ehrman/e/B001I9RR7G/ref=dp_byline_cont_pop_ebooks_1
I don't know why you might be here given the topic. Maybe it is to convert or maybe it is because you are not sure in what you currently believe. I offer this up if it is at some level you are still unsure. I read this book "How Jesus Became God: "The Exaltation of a Jewish Preacher in Galilee". It sure nailed the issue for me on Jesus being the third member of the Trinity...putting that notion in the "can't know" category for me. You can find that book here:
https://www.amazon.com/gp/product/B00DB39V2Q/ref=dbs_a_def_rwt_hsch_vapi_tkin_p1_i1
Of course there is the other side of the story here:
https://www.thegospelcoalition.org/reviews/how-jesus-became-god/