There are three routes I can fathom. Go on to the next one if you are unsuccessful.
1. Politely remind him that you are not trying to force any beliefs whatsoever down his throat, and request the same respect.
2. Hand him one scientific paper every time he hands you a leaflet advertising his religion.
3. Very abruptly explain the concept of burden of proof. This is a really simple concept. If someone tells you that there is a 700,000 pound doughnut on the the moon in a welded-shut box made of titanium the size of a cigarette pack, sitting on the ground, protected by a ring of invisible fire, it is not your responsibility to prove that it is in fact there, the burden of proof is on the one making the claim. It is default to not believe in lunar doughnuts that are not sized proportionately to their weight until it is otherwise proven.