You're a fledgling bird. You have no capacity for thought. You are aware of the wind on your downy feathers. The sun rises in the morning (you have no idea that it's the sun but you do see the light and you are aware of the warmth that the morning light brings). You hear your brothers and sisters chirping (you dont know who they are or what they're saying but you innately understand that they are like you, and find that you can make similar noises. It feels right when you do it too). Your mother (you don't know that she's your mother. Birds have no word for "mother") periodically leaves the nest and returns with food. You don't know what a worm is, but you accept it greedily, and so do the others in the nest. Everything is fine in Birdland.
One morning your mother returns to the nest, feeds you and the rest of her fledglings. One of your nestmates in doing what comes naturally, nudges you over the edge of the nest. Unfortunately, you begin to fall. You don't know you're falling. You have no experience of falling. You haven't learned that you can fly yet. You're unafraid and have no reason to believe that this feeling is in any way unnatural. You hit the ground and your state of consiousness immediately changes. You have just become acquainted with Gravity.
You had no belief in Gravity. You had no beliefs at all. You had never heard the word "Newton" before. If you had it would have had no impact on you at all. Nevertheless, you have succumbed to one of the laws of physics. No explanation, hypothesis, theory or belief required.
Don't confuse physical constants with religion. It can be as hazardous for you as a human as it was for you as a bird.
Any baby who rolls over for the first time and falls from the couch to the floor would tell you, if he was able to process the information and communicate it, that Gravity does, indeed, exist. I guarantee you that he doesn't care whether it is caused by an explanation given in a textbook, a dragon living at the core of the earth, or something called a Newton. He just wants his Mother.
Science and Religion are not the same. Science looks at "reality" in wonder and and asks why. A true scientist is always looking for the next, better answer. Thats why they call it the Gravitation Theory instead of the Gravitation Law.
Bottom line? You don't have to Believe in Gravity to experience it and know that, here, on this piece of rock floating in space that some of us call "Earth", objects have a propensity for falling in a direction that, in my neck of the woods, they refer to as "down".
I understand what you mean, but if Al Gore invites you out the window of a tall building, I respectfully suggest that you decline his offer.
now I did it!! 
