Okay let me retrospectively define "God" with a capital G in this case, the Western God of Judaism, Islam and Christianity.
-The only God
-The creator
-Personal God
-Holy God (pure/above everything else)
-Omnipotent (all powerful)
-Omniscient (all seeing/knowing)
-Benevolent (all good/loving)
-Immutable (never changes)
The logical definition above contains a good few arguments for his non-existence if you look closely

Such as how can God be benevolent, omniscient and omnipotent but still allow suffering/evil?