Conclusions sometimes include : `` God does not exist '' ( strong atheism ) ; `` God almost certainly does not exist '' ( de facto atheism ) ; `` no one knows whether God exists '' ( agnosticism ) ; `` God exists , but this can not be proven or disproven '' ( deism or theism ) ; and `` God exists and this can be proven '' ( theism ) . Conclusions reached include : `` God does not exist '' ( strong atheism ) ; `` God almost certainly does not exist '' ( de facto atheism ) ; `` no one knows whether God exists '' ( agnosticism ) ; `` God exists , but this can not be proven or disproven '' ( weak theism ) ; and `` God exists and this can be proven '' ( strong theism ) .