I think one fundamental truth in this universe that lead me to God was morality. The fact is that I am an absolute moralist. Even as an atheist/agnostic, I so wanted to be a relativist, but deep down I knew and accepted that some actions are always wrong, independent of culture or upbringing. And it was this realization that lead me to find God.
You will hear atheists claim that you don't need God to be moral, and that much is true. What many atheists refuse to address, at least in my experience is how they can claim one morality is superior then the other, by what objective basis is their morality better then someone elses. Similarly they don't address the fact that most people are absolute moralists anyway, thereby necessitating God.
This is how absolute morality necessitates God. If someone believes some acts are evil, as in always and absolute evil, like *bleep* or cold blooded murder, then they assume good and evil exists, and they are capable of distinguishing between them. The belief that evil exists, basically that some acts are absolutely evil or morally wrong, is only a consequence of absolute morality, and the only way to have absolute morality, is if there exists an absolute moral authority...ie God. Absolute morality, absolute evil, absolute wrong can only exist if there is an absolute authority to impose this absolute moral law. If the authority wasn't absolute, if he was temporal, then morality would be temporal, and not absolute. If there is no absolute moral law giver, then absolute evil doesn't exist. In which case, sometimes its morally OK to *bleep* or kill or steal.
There is no way around this. The only way some acts are always wrong, is if an absolute moral law giver exists to impose absolute morality onto us. If there is no absolute moral law giver, there is no absolute moral law. We are then subject to relativism, where all morals are equal by virtue of the fact that no human being exists in any manner that is superior to any other human. We sure like to believe we are better then someone else, we sure would like to believe that our morals are better then someone else, but that is all based on values, which is all opinion, and your opinion is not objective basis, its an opinion, and its personal, and is in no manner better then the opinion of someone else.
Very few people actually believe that sometimes, or in some cultures *bleep* is morally right, or that cold blooded murder is morally right. I have met a few that would claim this, but they are a minority. Most people accept that some actions against other humans are just always wrong, and in doing so, necessitate God whether they understand it or not.