Since we can't debate the existence of a God here, we have to put it in a Star Trek context. Gene Roddenberry was obviously an atheist because the Star Trek gods always turn out to be powerful aliens.
"In the Hands of the Prophets" DS9 dealt with this subject, with the Bajorans calling the Federation "Godless" because they think the Prophets are aliens, and that Keiko's teachings are against their religion.
But Sisko says to Jake that the aliens who built the wormhole see the past and future with equal ease, so why can't they be considered as "Prophets". He explains that it is a matter of interpretation.
But for the same reasons Aing-Tii gave I would say powerful aliens.