Hello, hopefully you will get a chance to read my article ( cited above) , I am not saying he pretended to die, I love him and respect him; I am trying to explain that God saved him from being crucified, by making someone else look alike
https://en.wikipedia.org/wiki/Substitution_hypothesis
Original Sin and Trinity are Paul's inventions, essentially changing Christianity from a monotheistic religion to a religion about Jesus and salvation by him.
Also, this is ill-logical, someone dying because Adam did sin and saving us from it and in return giving us salvation; this is one of the main reasons Why Christain convert to Islam ( not saying they should, but I guess when they see these contradictions they are tempted)
you can check with this simple search on YouTube ( if interested)
https://www.youtube.com/results?search_query=christian+accepts+islam