If one were to believe that God were a certain type of tree, surely he could say God exists, because he has seen the tree, he has felt the tree, he has experienced without a doubt, the tree.

If one were to believe that God were an all powerful, all knowing, and all loving, though invisible and untouchable being, surely many would have reason to wonder if God were real.

If one were to believe that God encompasses everything and all things were a part of God, all power, all knowledge, all physical things, all love and more, then surely one could say that he has seen God if he has seen a tree, he could say he has felt God, if he has felt the wind, he could say he has spoke to God, if he has spoke to anyone or anything.