Perhaps the most fundamental difference between non-Christian faiths and Christianity is that, knowingly or unknowingly, non-Christian faiths worship a FINITE god.
Perhaps, many non-Christian believers would be fairly confronted with the EVIDENCE that Christianity is the TRUTH, and of their vague identifications.
None of them can admit, like we Christians can, that their god is;
The creator of the entire, universe, heaven or earth.
In addition, the non-believer has little to identify their god with that hereditary God of the Jews - 'Jehovah' or 'Yahweh' - who became the FATHER of all in the Christian system.
Our INFINITE God is a God of salvation.
He's a spirit.
A strongly marked and knowable personality.
He exists, or strives to exist, in every human soul.
Yes, He's our infinite, and one and only TRUE God!