Proof A=A

[LukeMC]

3) God is neither observable or testable (due to his transcendence / residence outside the empirical realm).

Again, at the current point in time. This does not account for any future discoveries into realms we have yet to define and understand objectively.

The study of psychology, dream interpretation, and developmental stages and tendencies were once deemed outside the realm of observability, but appropriate venues for repeatability and observation were established.

Why would you scientifically discount something solely on the fact that we can't see it now and can't think of a way to do so? I'm pretty sure at one point in time the concept of flight for humans was deemed impossible, but within the last century, we have developed aeronautics and changed society drastically.

It would mean changing the definition of God, I understand, as God is defined as being outside of anything testable, and is superior to all. It's not a simple case of ever-expanding goal posts that will eventually encompass God, but a God that forever sits just outside the goalposts' reach at all times by defintion. It's safer for God that way as it means faith is always required no matter what.