Some Rationalistic Proofs For God

I have encountered several proofs for the existence of a Christian God, and have decided to summarize these as best I can.

1) The Beautiful World Argument
Creation is astoundingly complex. It exhibits an unexplicable level of intricacy, unless a creator is postulated. A God is necessary due to nature's beauty and aforementioned complexity. This argument is simple, but effective. Further readings on similiar arguments are copious. See Lee Strobel's Case For a Creator for similiar arguments.

2) Man as Shadow of God
The Christian God created man in His image. Therefore, God has several mannish traits (Or rather, man has several divine traits). Among these are a sort of Love, justice, independence, and a desire to work in his own interest. Keep in mind that man perverted these traits during the fall. This divinity is the Christian God, and seems inherently easy for man to worship and strive for. This isn't so much of a proof, but is a nice supplement to other proofs.

3) The Source of Man's Personality
We have two ideas. Man either has a personality, or is essentially a normal animal. Our instinct would like to believe the former, that we really do have free choice. It is also difficult to say that our personality came from impersonal, unfeeling nature, as immoral as that is. Therefore, we must attribute our personality to some higher source, namely, a deity. Now, this may not be the most convincing proof, but it is an excellent supplementary rationale. I take the idea from Francis Schaeffer's The God Who Is There.

4)Man's Hunger
This is a classic C.S. Lewis proof, found in his Mere Christianity, among other works. The premise is this: Man desires, however irrationally, some form of pleasure and lasting happiness that he cannot have. This hunger is compensated for through such pursuits as sex, vacations, hobbies, etc. Every other earthly hunger has something to fill it. Sexual desire: sex. Actual hunger: Food. The list goes on. This appetite evinces something more, and therefore we can believe in a God.

5) Purposelessness Without God
If there is no God, then man is absolutely without a real meaning in an absurd world (See Camus' works). This is a very difficult position, and when supplemented with Lewis' proof (See above) creates a very real temporal, as well as eternal, need for God. If it weren't for this meaninglessness, I might very well be an atheist. I hold this proof rather close, as I have really legitimized my belief through it.

6) The Bible
Now, it is rather circular logic to use the Bible to prove the Bible. However, the real proof lies in that the Bible is an accurate source of historical truth. Thus, it has some credibility, which we can view in its historical accounts. This accuracy of realistic detail gives the Bible a reality to it, that is far easier to accept than the pantheistic mythologies of the past. Therefore, external proof grants a real light of credibility to the Bible.

Now, I agree with Kierkegaard in that rationalistic proofs can never increase faith. Man does need to make the decision and intellectual leap to come to God. However, these proofs (I hope) can help others in their Christian walks.