I think the argument from causation has been mentioned here before, but i'll give my own reasons for believing in God
Firstly, everything finite has a cause - everything that we have come to observe has a cause for its beginning. The cause for my existence comes from my parents, and from their parents to their parents and so on.
If we continue down the line of causes, eventually we will reach the beginning of the universe - surely the universe is finite and must have a cause for its coming into existence right?
The cause for the universe coming into existence is due to God.
But what about God? Must God not have a cause if we agree that everything has a cause? If we still accept that everything has a cause, then an infinite regress would be apparent.
God's existence must abide by the implications of logic, therefore God must also have a cause!
However, the initial premise is that ' everything finite has a cause', God is not finite. Therefore God need not have a cause.
Secondly, if that doesn't work, then we can question logic itself. Valid inferences in logic are valid only because such rules are agreed upon by the academic community. Accepting a general rule for valid inferences in logic relies on individuals' intuition prior to adopting the logic in question.
God's existence isn't refuted based on a system that is manufactured by infinite minds, because the system that purports to refute God's existence is itself questionable.
Therefore God possibly exists
Anyways.. these are my thoughts...