***You cannot prove the existence of God. ***
I would be more worried, Dear Kosta, that God can prove the existence of you.
That's nonsense. Why should that be a source of worry? It always amuses me that, when faced with their own impotence while trying to impose their beliefs as "facts" on others, some resort to scare tactics and threats in the name of God.
My existence is no more a proof of God's existence then the existence of the rest of the Universe is. The Creation suggests that soemthing created it; it doesn't say much more about it. For, all indications are that the Creation had very little purpose vis a vis our own existence. We could literally be blown to pieces out of existence, and neither the nearest star (four light years away) nor the Galaxy, let alone the Universe would not even notice.
It should really make one wonder why would God make this vast structure, void of life, harsh and barren and, where there is life—without compassion. For there is no mercy among animals and men left to their own devices
It is actually our knowledge of mercy that betrays an out-of-this-world existence.