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One understanding of what it is  to conceive the existence/nonexistence 
of something is that it is to imagine experiencing its presence/ absence.  But if 
this is, indeed, what it means to conceive the existence/nonexistence of  existence/nonexistence of 
something, it seems  clear that the nonexistence of God is  inconceivable. 
Consider the following reasoning. 
One understanding of what it is to conceive the existence/nonexistence of something is that it is to imagine experiencing its presence/ absence. But if this if this is, indeed, what it means to conceive the existence/nonexistence of somethingof something, it seems clear that the nonexistence of God is inconceivable. 

Consider the following reasoning. 

To experience the absence of a  thing x is to experience the presence of some of some other thing y, whose presence is incompatible with that of x. But  But it is a contradiction a contradiction of the very concept of God to suppose that the presence of anything of anything could be incompatible with the (omni-)presence of God. Therefore, there  there is no way of imagining experiencing God's absence absence, because one cannot imagine cannot imagine experiencing the presence of anything that would be incompatible with incompatible with God's presence.

To experience the absence of a thing

Assuming the understanding of what it means to conceive God's nonexistences nonexistence, then, there is no way of conceiving it. For one cannot imagine experiencing imagine experiencing the presence of anything with which God's presence would or could or could be incompatible.