The point there is that the "just believe what we tell you to, don't question or ask for evidence" culture he claims to have been in is in no way representative of the whole of Christianity.
Errr... you do realize that you are quoting Jesus, right?
Specifically, Jesus after His resurrection, to Thomas who believed because Jesus was right there in the room in front of him.
Those were not a Nazi innovation. That inscription on the buckles was a German Army tradition that went back to before Germany existed as a unified state.