If you believe there is no God, you have faith.
No human can absolutely disprove the existence of any God.
That's because no human can be in all places at all times.
Christians believe in the one true God of the Bible.
The God of the Bible, who can be at all places at all times, tells us in His word that He is the one true God.
Any other "gods" are simply devils.
Atheists, on the other hand, don't have a witness to refer to who can be at all places and all times.
Therefore, they take it on faith that no God exists.
They can't actually prove it.
To sum up:
*If you believe there is no God, you have faith.
*If you simply say that no one can know if there is a God, you don't necessarily have faith.
2 Samuel 7:22
"Wherefore thou art great, O Lord God: for there is none like thee, neither is there any God beside thee, according to all that we have heard with our ears."