This was a difficult question to ponder because after all it's was a difficult one to place within sciforums forums structure. On one hand you have the fact that both are Religions, however both owe their roots to Science Fiction. After all Scientology's birth was from Scifi author L. Ron Hubbard (Check Wiki) versus the renound universe of Gene Roddenberry (StarTrek), in particular the character Spock (The Churches site?) Now I place this scenario forwards that both religions are hellbent on creating converts, and while one has a rally the other religion turns up in a few buses to try and counter this recruiting drive. As they have a faceoff, Scientologists on one side and Later-Day Science Officers on the other... Who without shadow of a doubt wins the battle of Scifi Religion supremacy? (You should now take a while to ponder before accessing the poll... The Illuminazi are watching and intrigued by your responses)
If we get many alternate Scifi Religions to the ones mentioned, We'll have to draw up a League table. Kind of a Fantasy Scifi Religion Street Brawl League.