A slight issue I have with saying that religion is propaganda is that this does a disservice to propaganda. Propaganda may well contain some lies and some half-truths, and, at best, it's promoting "truth" from a very one-sided point of view (your side) and may be omitting uncomfortable "truths" from the other side that might have counterbalanced your "truths" or even negated them. On the other hand, religious instruction (I'm trying to be diplomatic by avoiding words such as indoctrination or proselytising), of the type I was subjected to at school, is entirely predicated on lies. I think there is a difference.