if you use the sunlight as a gross example of omnipresence of the sun (in the daytime) one can still determine the distinction between the sun and the sunlight as different phenomena - similarly just because god is omnipresent it doesn't mean that everything is god. God has different potencies than his separated energy, just like the sun has different potencies from its separated energy (the light)
Do you want to say that GOD, being omnipresent, is present in all things and beings in different quantities as sunlight is present or even not present in dark? If so, how he can be considered as omni-potent?