I grew out of the Easter Bunny, tooth fairy, Santa phase too. When they would produce money under the pillow, presents under the tree, and chocolate filled eggs we believed though right? We had faith in them even though we'd never seen them, because they delivered us things.
God on the other hand is still producing, therefore I still have faith in Him. Some can see it, some can't.
There's nothing in my life that appeared by magic. Everything I have I worked for, bought, was given to me as a present by another human, or made myself.