Philosophy of religion is the branch of philosophy that inquires into the nature of the divine, and includes topics such as: the problem of evil, religious experience, miracles, and arguments for or against the existence of God.
"Is God willing to prevent evil, but not able? Then He is not omnipotent. Is He able, but not willing? Then He is malevolent. Is He both able and willing? Then whence cometh evil? Is He neither able nor willing? Then why call Him God?" -Epicurus