Proof of Existence of God?
God created this universe, including the sun, the earth, and the moon.
God set various physical conditions in the structure of the universe and physical laws that work in the universe so that life would be created on the earth and living things evolved ultimately to the mankind. And God sent spirit from Heaven to each human being so that human beings could be different from other species and behave like angels in Heaven.
But, if you cannot accept this theory, you would live in a manner against the teaching of God.
If there is no God, you can deny existence of Heaven. You can even deny existence of the hell. You will surely deny life after death. Then, you will concentrate on living in this world. You will think that life is only once and there is nothing after your death. So, you will try to be rich as much as possible using basically any means. You will have no compassion to the poor.
You would think that this universe was created only by chance. The sun, the earth, and the moon were created all by chance. And, you think that you were born only by chance as a member of the human species that happened to have intellectual ability. You would even think that your mind happened to emerge. And you think that there is no God that punishes you if you don't follow the teaching of God.
To be against God, you use your mind and the ability of thinking you think that you happen to possess. But, you cannot explain how you have come to your mind and the ability of thinking. You think that they were created all by chance.
However, all these things those who do not believe existence of God think cannot be proved. It cannot be proved that all these things have really happened by chance. You cannot prove that your mind was created by chance. You cannot prove that you came to exist in this world by chance. You cannot deny that all these things have been all created and arranged by God.
A simple proof that God exists is that even a human being like you with a limited level of ability and intelligence can exist or enjoy living, God with a much higher level of ability and intelligence must be able to exist or enjoy living. At least you, an entity at a lower level, cannot deny God, an entity at a much higher level. Even you with limited ability can happen to achieve living; then God with unlimited ability can surely achieve living.
As you now absolutely exist, God can absolutely exit. And you cannot deny that you are allowed to live by God. To believe existence of God and assume that God gave life to you is more natural than suppose that you happen to exist all by chance. "Natural" means having a higher possibility.
The moment you accept existence of God or a great possibility of existence of God, you cannot be rich, since God or Christ Jesus teaches that men cannot serve both God and Mammon.
Most of rich men feel existence of Satan that recommends them to do evil things to be rich. If they believe existence of Satan, they implicitly admit that God exists, Then those rich men have voluntarily decided to become enemies of God.
Incidentally, the possibility that this universe can have such physical characteristics and constants as assure the formation of galaxies, stars, the sun, the earth, and living things on the earth is almost zero. And the possibility of life on the earth evolving to the human species is also almost zero. This universe and the mankind were apparently created by God for some mysterious special purposes. We do not exist on the earth by mere chance.
Anyway, how can you deny existence of God, or why do you deny existence of God?
This equation cannot be established by mere chance.
http://www.pbs.org/wgbh/nova/physics/legacy-of-e-equals-mc2.html
APPENDIX: The Universe Tuned by God
The fine-tuned Universe is the proposition that the conditions that allow life in the Universe can only occur when certain universal fundamental physical constants lie within a very narrow range, so that if any of several fundamental constants were only slightly different, the Universe would be unlikely to be conducive to the establishment and development of matter, astronomical structures, elemental diversity, or life as it is understood...
If, for example, the strong nuclear force were 2% stronger than it is (for example, if the coupling constant representing its strength were 2% larger), while the other constants were left unchanged, diprotons would be stable; according to physicist Paul Davies, hydrogen would fuse into them instead of deuterium and helium.[9] This would drastically alter the physics of stars, and presumably preclude the existence of life similar to what we observe on Earth. The existence of the diproton would short-circuit the slow fusion of hydrogen into deuterium. Hydrogen would fuse so easily that it is likely that all of the Universe's hydrogen would be consumed in the first few minutes after the Big Bang...
Epsilon (ε), a measure of the nuclear efficiency of fusion from hydrogen to helium, is 0.007: when four nucleons fuse into hydrogen, 0.007 (0.7%) of their mass is converted to energy. The value of ε is in part determined by the strength of the strong nuclear force.[13]If ε were 0.006, only hydrogen could exist, and complex chemistry would be impossible. According to Rees, if it were above 0.008, no hydrogen would exist, as all the hydrogen would have been fused shortly after the big bang.
https://en.wikipedia.org/wiki/Fine-tuned_Universe
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Joh 5:30 I can of mine own self do nothing: as I hear, I judge: and my judgment is just; because I seek not mine own will, but the will of the Father which hath sent me.