Original: This assertion leads to a polytheistic interpretation of Christianity where god is not omnipotent , but since Plantinga 's goal is to defeat only the assertion that God and evil are logically incompatible , even a highly implausible but possible , coherent instance of God 's coexistence with evil is sufficient for his purposes .
Simplified: Since the aim is only to defeat the assertion that God and evil are logically incompatible , even a highly implausible instance of God 's coexistence with evil is sufficient for the purpose .