Q. (2) Why is not the God of the Christians the God of them that are no Christians?
A. He is their maker and preserver; but they have not chosen him to be their God.

Acts 17:24

The God who made the world and everything in it, being Lord of heaven and earth, does not live in temples made by man,

Psalms 36:6

Your righteousness is like the mountains of God; your judgments are like the great deep; man and beast you save, O Lord.

Judges 10:14

Go and cry out to the gods whom you have chosen; let them save you in the time of your distress.