This need for an explanation by Christians Ehrman mistakenly calls “exaltation christology.” According to Ehrman the first Christian writings twenty years after Jesus death were based on pre-literary traditions. What this means is that Paul and other NT writers were borrowing from those prior sources and it was in these pre-literary sources which gave rise to “exaltation christology” which began the belief that Jesus became God when Jesus was raised from the dead. It is Ehrman’s own sticky subject. Ehrman's dismissal of the apostles' first century writings on the basis that these are merely a reflection of earlier "exaltation christology" is mistaken. If Ehrman's few references to that christology are any indication, -and they are- there is nothing in it which is at odds with the whole of NT and OT writings.
“Don’t let your heart be troubled. Believe in God. Believe also in me. (John 14:1)
peace to all.