There are no ways to prove or disprove the existence of a legit religion. That's like asking someone to show you an alien for proof of the existence of extra terrestrial creature. They can't do it. Now, I can't prove the existence of any religion by grabbing a god out of nowhere and shoving it in your face, and you can't disprove the existence of any religion by denying it all. But, I will say this: Religion is our way, as humans, of explaining things that can't be explained. If an event that defies the laws of universal sciences takes place, then we just say that it was a miracle. Supposedly, many people don't want to have the thought of not understanding something in their already clouded mind. Therefore, people give a reason to everything.
In conclusion, I can't prove the existence of anything to you unless you're asking me to mail the Buddha to PO Box.