If God is taken to be the omnipotent, omniscient, and benevolent creator of a system that progresses linearly (ie, through time), fairly large contradictions arise.
If a god knows exactly what course our system (universe) will run, why would he punish creatures for doing what he set them up to do. Punishing something/someone for what you made it, isn't benevolence.
Or, perhaps, you'd like to look at things on a smaller scale? Would a benevolent God curse a child for the sins of its father? How about two or three more generations of that child's offspring?
The Christian god does:
"....he punishes the children for the sin of the fathers to the third and fourth generation." -- Numbers 14
In fact, he has quite an affinity for cursing. But you shouldn't need anyone to point out things from the book you live your life by.
People don't like to admit it, but in this universe we live in there is only two possibilities for any individual condition. We live in a a binary universe. Everything is a collection of yes and no.
An omniscient god knows these conditions, and he knows what value they'll take before they do. Therefore, free-will is an illusion, easily proven by a fairly straight-forward progression of conditions laid out by your 'book'. I'll let you draw your own assumptions about a God that would create a scenario where children are being machetted in a shithole like Sierra Leone.
And I won't even get into the contradictions between omniscience and personality.
