Ascension has nothing to do with any spiritual stuff or anything like that, I am 100% sure of that. Both regarding stargate and real life.
There comes a time when a species have no need for a physical body, it's evolution. You get there by waiting for it to happen, or get there by manipulating youself. Starting to pray and stuff doesn't make people ascend.
Oma helps the "right" people ascend, because they don't want any more Anubis' ascended. That doesn't mean Oma got there by going all spiritual.