The universe can not function without a standard. Logic: Imagine a true relative universe. It would not exist. For there to be a bigger or a stronger, there must be a biggest or a strongest. In fact, logic would not function without an accepted standard. The universe, however cannot contain its own basis for existence.
Science (in a nutshell): Einsteins theory of relativity (not to be confused with relativity mentioned earlier) proves that if we exist in a logical universe, it had to have a beginning. A singularity is not nothing. Spontaneous generation is impossible; when Darwin wrote his theory, he thought the cell was a blob of goo. We now know that their are, at the minimum, hundreds of thousands of crucial pieces to the cell at any given moment for the cell to work. This cannot evolve from anything more simple. If I believe in no god, then I believe that what is happening in my brain is mere chemical reaction, which means that I should not be thinking right now, nor should I experience life from a first person perspective. If you can perceive this article, you have proof of the supernatural.
Theology: A common argument against the existence of a loving god is, "If God doesn't want bad things to happen to people, and He is omnipotent, then why do bad things happen to people." Mankind has been a disgrace to God, according to the Bible, and he is cursed. God allows things to happen on their own sometimes as a punishment, not of that person, but of the entire world. Another is, "I tried praying, and it didn't work." This one is simple. God does not like to be tested and He does not respond to unbelievers.
Historical: I don't have time for all of these, but the most important is that all of the prophesies about Jesus came true.
If you disagree, don't get mad. Tell me why.