Here is the Proof

Atheists always ask for proof of God.

Well, there is, it's called common sense.

For example, if you walk on the beach, and you come across a heart made out of stones.

- Max Pixel

Would you then conclude that it washed up like that, or would you conclude that someone put it there?

Exactly. Someone put it there. It's a logical conclusion. To say that it was formed by itself like that is just stupid. There is no reason to make that assumption.

The complexity found in nature clearly comes from a Creator.

- By Nissim Benvenisty / Wikimedia Commons / CC BY 2.5

Only a fool will deny it.

The fool hath said in his heart, There is no God. They are corrupt, they have done abominable works, there is none that doeth good.
- Psalms 14:1 (KJV)

There is no excuse.

For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse: Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
- Romans 1:20-21 (KJV)