Denying God takes effort. So the claim that atheists/evolutionists make that there is no proof of God is bogus. In order to deny God atheists/evolutionists have to:

1) Make up another story for the origin of man such as apes just turing into humans or breeding human descendants when they haven't done that since the beginning of recorded history. That entails volumes and volumes of trying to fit a square peg into a round hole that can't be proven to occur in reality.

2) Changing history and inventing a new history of the Jews to claim that the first man wasn't Adam. That takes a great amount of effort.

3) Making up new events that happened in Jerusalem to claim that Jesus didn't show his divinity through his words and actions.

4) Spending thousands of hours trying to figure out how the earth was formed, particularly since it took, according to evolutionists, man millions of years to think up the "Big Bang."

5) Trying to figure out why all the disciples and apostles would give up their lives for a lie.

6) Claiming there is no intelligent design using contradictory claims that chance causes cause-effect in the universe.

7) Claiming that energy can be converted into mass when energy doesn't contain mass.

8) Claiming that sex between humans is bestiality because they claim that humans are animals; or claiming that bestiality is sex between humans and animals, but denying that sex between humans is bestiality even though evolutionists claim that humans are animals!

9) Atheists claiming that they know better than eye-witnesses what happened at an event that atheists themselves didn't witness.

10) Trying to explain the sedimentary rock layers all over the world in any other way than a flood including a world-wide tsunami.

11) And even with all their effort, no one has still been able to explain the existence of the first living organism, the first plant, or living being. Yet atheists refuse to admit God's existence.

So the above scenarios are deliberate denial of God because they take a tremendous amount of effort to conjure up. Some people spend their whole lives trying to find explanations that deny God. So this shows that not only do humans know that God exists because of the effort they have to put into trying to refute God, but the irrational and contradictory arguments they have to endorse to deny God!