A big reason why I am secular:

"The biggest difference between belief and knowledge is – it is the tendency of most people to test their beliefs and not their knowledge. When we are sure we know something, we do not really go back and try to verify it. We tend to accept our knowledge more readily than our beliefs. Our beliefs, however, are constantly put to test; by us, by people around, by situations, experiences among many other things."

"Knowledge is indispensable, yes. However, belief is equally important. A simple example – if I do not believe that a tablet of an analgesic will take care of my headache, I will never test my belief. Hence I may never know for a fact that an analgesic actually does relieve headache. However, even if I don’t believe, it does not change the fact that analgesic tablets do relieve headaches. In this sense, knowledge is not based on belief. However, the more you can base your belief with fact, the stronger your belief will become. (or in turn, the lesser facts you find to base your belief on, the weaker it will become). Hence belief is affected by the knowledge you have."