First, I would like to say that to those who are not believers; they can not or never understand why we believe what we do. for their minds are veiled from the truth.
but to give them something to think about as in to plant a seed, hopefully in their heart.
God was never created; he had no begining nor will he have an end.
as for God creating us; Machew said it perfectly.
and for the comment, that we can not prove God's existance; that is not true. As one said He talks to us, they said he talk to our minds, but it is deeper then that. he speaks to the heart and soul of man and those who are born again christian he not only speak He show himself to us, and communicate through our spirit by his SPirit.
The proof: How can it be explained when you are praying for something and a complete stranger tell you God heard your prayer and tell you everything you asked God for and give you God's answer? How can you see a vision of something dangerous or good before it happens. And it happens just how you saw it? How can you stand in prayer and someone tell you what is happening to you while you are before God and you are silently talking to God while he hold you in his arms and comfort you ? tell me how can you and someone else see the same things at the same time ( angels ) when God let no oter at that time see this to confirm that you are not loosing your mind?
God does not and will never prove his existance to anyone to make them a believer , but only to those who are believers will he show himself faithful. As Jesus said : a wicked and perverse generation seeketh a sign and the only signs; one has passed the the other is to come when we see our Lord coming in the clouds.
The proof; is there any science that can explain how these things can happen? and this is not even 1% of the things God has done for me and others that is proof. and man can't explain it away. the healings that doctors can't explain, when they say you are as good as dead, but God said as they believed him they shall live and not die?
The proof; creationn itself; look around you. every time we step out side we see the proof that there is a God.
when we look in the mirror ; we see proof that there is a God. for man is God's greatest creation. God is in everything and it is all His.
We know that God created everything because he is perfect, and everything has its place in this world and it functions just as perfect as it's creator.
Man was once perfect before sin enter their hearts; and now everything we do is imperfect; that is why we know man did not create God. for God is perfectly perfect.
And the proof of his existance is the creation of US.
God bless all who seek him and truth, glory to God and all prasies be to him.