You could believe in a supernatural cat and it's still as valid as any other religion.
You're completely full of shit, and you're making stuff up.
Definition:
re·li·gion
riˈlijən/
noun
the belief in and worship of a superhuman controlling power, especially a personal God or gods.
"ideas about the relationship between science and religion"
synonyms: faith, belief, worship, creed; More
a particular system of faith and worship.
So to say that a particular religion is and I quote "Made up" is to say that that
PARTICULAR religion is made up is to say that it's not real.
NOT that religion itself is fake (Which I agree with).
Choose your words wisely.