Why Aren't Theists All-Powerful?

If God is truly the Infinite-Being and the Theists are His closest followers, than surely the Order of Infinity should be able to wipe the floor with anyone or anything they come up against?...
Well, not exactly.
First off, all Theists are finite creatures and so cannot channel the full range of any of God's powers. Because, you know, God's powers are infinite. For the Hands of God this is especially evident: if they push themselves too far, Theists using the power of Destruction can freeze themselves to death or if using the power of Creation they can burn themselves. 
The point being that a finite creature can only channel so much of the powers of Infinity Itself. 
Other explanations may also be possible, such as the idea that the Theist in question lacks faith, lacks in morality, needs more discipline, etc.
Category:God