A monster is any fictional creature, usually found in legends or horror fiction, that is often hideous and may produce fear or physical harm by either its appearance or its actions. The word "monster" derives from Latin monstrum, an aberrant occurrence, usually biological, that was taken as a sign that something was wrong within the natural order.
By the first one, god only one of the descriptions, and so therefore he is not a monster. By the biblical god, He is not hideous; he is a light the can blind your eyes out and is glorious too.
By the latin Monstrum, he is kind of. God causes things that sometimes are consider abnormal, though not really.