I am a Christian, and I'm starting with the basis of God's existence. I know it is true. Regardless of that I know some of my readers may not be Christians and may not believe God exists at all. If that's you, then just read and consider these things. We may both be absolutely certain that we're right, but someone's got to be wrong, so take a read!
So God created mankind in his own image,
in the image of God he created them;
male and female he created them.
Romans 2:14-15The very fact that we have morals is a proof of God's existence. If we are just mutated pond-scum, then there is no reason that we should have feelings about what is right and wrong and there is no reason that society should build in systems to restrain itself. By doing so we would inevitably restrict the evolutionary process by preventing the strongest from surviving. If evolution was true, we wouldn't do that. Genesis 1 tells us that God created us in his image - that's why we have morals, because God created us that way - he is perfect, holy and good, and therefore he has given us the ability to recognise those things, at least in part.
Indeed, when Gentiles, who do not have the law, do by nature things required by the law, they are a law for themselves, even though they do not have the law. They show that the requirements of the law are written on their hearts, their consciences also bearing witness, and their thoughts sometimes accusing them and at other times even defending them.
When Adam and Eve ate the fruit from the tree of Knowledge of Good and Evil, they experienced sin and rebellion to God. From that point on they knew what shame and guilt were. We, like them, have consciences that tell us off when we sin. Even those who do not have the bible have a moral code that they live by - that's what Paul is talking about in Romans 2. By listening to our consciences we can know that there are things that are good and things that are evil. This is not determined by society (though perhaps it is enforced by it), it is created in us by God, and even though our consciences have been tainted by sin, they still leave us without excuse for our rebellion against God. We have a knowledge of what is good and what is evil, and we naturally tend towards sin because of the sinful natures we inherit off Adam and Eve.
Morals aren't an advance in evolution, they are created by God and based on who he is - he is the definition of goodness and perfection. Our morals flow from who he is - and even when we don't understand that, he often uses our consciences to point out what is right and wrong so we are without excuse for sin. The law is written on our hearts, not because we evolved that way, but because God put it there. Consequently having morals and a conscience proves God's existence.
Ecclesiastes 3:11The existence of religion is also a proof of God's existence. The bible, God's word, tells us that God set eternity in the heart of man - we know that we are meant for more than just a meaningless and short life on earth. I don't like using arguments based on feelings, because feelings change, but it seems to be an underlying idea throughout history and n our world today that there is more then just life. People have always strived for immortality, to be remembered. No one wants to just cease to exist.
He has made everything beautiful in its time. He has also set eternity in the human heart; yet no one can fathom what God has done from beginning to end.
This is even shown by the fact that we are proud - why would we be proud if we believe nothing matters once we die? Surely if we consider or lives here as worth nothing we would simply do our best to enjoy them and then die - why be proud about our achievements? They would inevitably mean nothing. (Note: That doesn't make pride right, but it shows that we generally think there is more then just life on this earth.)
God has created us with the knowledge that he exists, and even though we have rejected him, it has led people to create religion. If evolution was true, then it would be stupid for us to create rules to restrict us and prevent us from living how we want. It would also be stupid to 'create' a being that is stronger than us - if we are the pinnacle of evolution we wouldn't be putting anything above us. Evolution isn't true, it is just a theory by those who want to deny that God exists. If we remove God from the equation we can live how we want. But we can't remove him, because no matter how much we deny his existence, that doesn't change the truth: God, The Holy Spirit and Jesus are all the one God and they all exist, and they are who they say they are.
The existence of morals and of religion are both proofs of God's existence. They both restrict us to some extent from living how we want - which would be in rebellion to God's perfect standard - and no evolved being would restrict themselves from being the fittest and strongest and doing whatever they please. Nevertheless we have rejected God and these things are flawed - we do not always know what is right and wrong and people have created religions apart from the true one.
Part three is here
P.s. Click here for a great video on the topic.