 Still other opponents of natural theology are atheists. Atheists agree with fideists and agnostics that our natural faculties cannot establish the existence of God or other religious entities. But that’s because they think those faculties provide reasons to believe that such entities do not exist at all (see the entry on  atheism and agnosticism).  One such reason is the negative one that we cannot produce any sound arguments for theistic claims. But atheists also often maintain that there are positive reasons to believe that God does not exist—the incoherence of the concept of God, for instance, or the incompatibility of God’s existence and the existence of horrendous suffering and evil (see the entry on the problem of  evil).