Yes it's hilarious that the Goa'uld or the Wormhold aliens or whoever get to be the Gods or prophets of entire species and planets but the only way they get to do that on earth is if it's a dead culture such as ancient Egypt.
Well, it's less likely to offend the viewing audience that way.
I don't think they ever even hinted at Q being Jesus. If anything, they might have hinted at Satan, but I don't recall that.