Arguments for the existence of God that have been made over the years include:
- the ontological argument, based on arguments about the "being greater than which nothing can be conceived"
- the cosmological argument, which argues that God must have been around at the start of things in order to be the "first cause"
- the teleological argument, which argues that since the universe is highly non-random, it must have been designed by an intelligent designer, God
- argument from common consent: people in all times and places have believed in God, so who are you to disagree
- argument from morality: since morality cannot exist without God, God must exist
- transcendental argument for the existence of God: logic, science, ethics, and other good things don't make sense if God doesn't exist. Therefore God does.
- Christological argument is specific to Christianity - become a Christian and believe in God
There have also been some arguments against the existence of God. The primary one is the problem of evil.
See also: philosophy of religion, metaphysics