I agree, but your reasoning isn't going to help your position. They say, "how do you know God is real?" and you reply, "well, how do you know anything is real? You don't. Therefore God exists." This is foolish. They can simply come back and say, "okay, then unicorns exist". Your reasoning isn't rationalizing the existence of God. Instead you are just negating what we perceive as existence. All concepts are based on our perception of reality. So if you negate our perception of reality as possibly be false, then you consequently negate the concept of God. Because you are conscious and question the fleeting nature of things, you have come to this concept of God. Just try to stay on that track instead of going down the path of complete negation. That will lead you nowhere (obviously).