This is begging the question: It only holds water so long as you assume from the outset that there is no God. If there is, it would stand to reason that there might be immitator religions which are false, and a true main religion.
That only applies if you don't consider time. You are a Christian, and so most of those other religions are not imitations, they originated before yours did. If there is an original and imitations, then yours is clearly an imitation.
The Christian religion came after the Jewish religion, from which it absorbed some beliefs and rejected others. What's that saying? That from the Christian point of view, Judaism was right, or it was wrong?
But it wasn't just the Jewish religion that Christianity absorbed. It also absorbed elements of paganish, such as yuletide, which was rebranded as Christmas.
If there's one true religion, and the others are imitators, Christianity is certainly an imitator.
Science may not be able to prove nor disprove a god. But science and history between them can certainly explain why people believe the various religions - and it has nothing to do with whether there's a god or not.