John Ostrander created a character who channeled the same power. Forget his name, but he was some kind of cleric like character, channeling the power of heaven.
Hard to gauge him overall, but Spectre wasn't able to affect him at all with his powers. The way he finally took him down was funny, creating a whirlwind so he was hit by the debris.
The fact such a character exists, calls into question just how much power there is to absorb, vs what's channeled from a higher power.