I've been reading stuff on this forum and it seems that others people feel the way you do, and I'm going to try and explain, as I have there, why I don't feel this way at all. If what I say seems insulting, know that this is not my intention.
A lot of Christians nowadays are being lazy about the intellectual aspects of Christianity, and so the only bits of intellectual argument they hear are the secular ones, which point away from God. And to try to combat their doubts they look in a spiritual direction, which will do them no good in this case because it is their reason that is troubling them. But there is perfectly good intellectual opposition to materialism, nihilism, and evolution, that have been presented by educated men throughout history. But instead the modern Christian is just listening to the atheist talk about evolution (overstating it's scientific validity in the process), and then will walk away full of doubt, and think that there is nothing they can do about it but hold onto some Godlike experience they have, which their reason ultimately tells them is not a rational enough position, and so many lose their faith. I urge all Christians to wake up their God given brains and put them to use.
An example of evidence for the new testimant:
Tacitus is generally accepted as greatest Roman historian. In his Annals, he mentions Christ in a passage which most scholars accept as authentic regarding the Emperor Nero:But neither human effort nor the emperor’s generosity nor the placating of the gods ended the scandalous belief that the fire had been ordered. Therefore, to put down the rumor, Nero substituted as culprits and punished in the most unusual ways those hated for their shameful acts [flagitia], whom the crowd called “Chrestians.” The founder of this name, Christ, had been executed in the reign of Tiberius by the procurator Pontius Pilate [Auctor nominis eius Christus Tiberio imperitante per procuratorem Pontium Pilatum supplicio adfectus erat]. Suppressed for a time, the deadly superstition erupted again not only in Judea, the origin of this evil, but also in the city [Rome], where all things horrible and shameful from everywhere come together and become popular. Therefore, first those who admitted to it were arrested, then on their information a very large multitude was convicted, not so much for the crime of arson as for hatred of the human race
Here is Thomas Aquinas's five point proofs on the existence of God:
Motion: Some things undoubtedly move, though cannot cause their own motion. Since, as Thomas believed, there can be no infinite chain of causes of motion, there must be a First Mover not moved by anything else, and this is what everyone understands by God.
Causation: As in the case of motion, nothing can cause itself, and an infinite chain of causation is impossible, so there must be a First Cause, called God.
Existence of necessary and the unnecessary: Our experience includes things certainly existing but apparently unnecessary. Not everything can be unnecessary, for then once there was nothing and there would still be nothing. Therefore, we are compelled to suppose something that exists necessarily, having this necessity only from itself; in fact itself the cause for other things to exist.
Gradation: If we can notice a gradation in things in the sense that some things are more hot, good, etc., there must be a superlative that is the truest and noblest thing, and so most fully existing. This then, we call God -->note Thomas does not ascribe actual qualities to God Himself.
Ordered tendencies of nature: A direction of actions to an end is noticed in all bodies following natural laws. Anything without awareness tends to a goal under the guidance of one who is aware. This we call God --> Note that even when we guide objects, in Thomas's view the source of all our knowledge comes from God as well.
Here is a video about the science of DNA,
[video=youtube;1--tP49mOoE]http://www.youtube.com/watch?v=1--tP49mOoE[/video]
An argument of morality:
If you listen to people quarreling you will inevitably hear someone say something like "That's not fair, you made a promise" or "I shared with you, now you should share with me". Everyday people make the assumption that there is some standard which all people at bottom understand, and ought to follow. When people break promises they often say that the promise was not fair, you will rarely hear them say, "I don't care", because deep down, they agree about the standard, they would just like an exception in their case.Some people say that this is evolutionary instinct, a herd mentality.But often this herd mentality comes in direct contradiction with the survival instinct. If a man is crying for help, you have two instincts, the herd instinct is telling you to save him, and the survival instinct is telling you to not risk your own life. But there is a third thing that is telling you which instinct you ought to follow, and which you ought to suppress. This third thing is neither of the instincts, it comes from somewhere else, and it often sides with the weaker of the impulses, and causes you to do things like stir up your pity for the man in trouble in order to get you to do what you don't want to do, but know that you should. There is no way to determine what should be done from observing what is, and yet we all have a knowledge of what should be done. This third thing, the source of moral knowledge,cannot be accounted for without presupposing the existence of God.
And lastly, my personal favorite, a formal proof constructed by my favorite Logician Kurt Godel,
Some of this might seem confusing, but the reason I think it is very important that you at least know these things exist is because most people doubt their faith because of the theory of evolution without really knowing much about the theory. In the same way, I hope that your faith will be restored by knowing that there is intellectual evidence of God, even though you might not understand all of the evidence.