Dark matter is a scientific hypothesis on the basis of evidence. It is implicit in describing it as a hypothesis that it may be wrong, and if it is wrong, then the scientifically-inclined person will change their thinking to reflect the better explanation. Certainly the universe behaves as though dark matter is a fact, even if it hasn't been discovered as yet. If it is wrong, it will fascinate and enthral me as much as if it's correct; it's about understanding how the universe works. Can you honestly say the same about your belief in God..?
Incidentally, what are you going to do if the LHC (or similar) finds dark matter and kills your argument? These sorts of arguments are very dangerous to you, because you're constantly in danger of squeezing God out of yet another gap.
Anyway, this is not analogous to belief in God, no matter how many times you assert otherwise.