Real One,
You need to broaden your view a bit. Note that the topic of this discussion is "religious belief" and not "belief in the Christian God". Two-thirds of the world's population does not believe in the Christian God. Their view of God is quite different than yours. The topic of belief (or non-belief) applies equally to those outside the world's Christian population too, and it also would apply to the Romans and their gods in their day.
You're so sure that yours is the only possible god (or trinity of gods) that it's really off-putting.