God is of course omnipotent, omnibenevolent, & omniscient. The question, however, is illogical & solipsistic. 'Can God create a rock that is too heavy for God to lift?' is like saying that someone is a married bachelor. The question, like the phrase, is a contradiction in terms, & therefore has no connotation in English (or any other language).
Alright, we'll ignore the question since you've admitted it is beyond your ability to grasp.
If God is omnibenevolent, which loosely means "Good guy all around ", then why has He commited such foul acts in the Bible? I'll give you one example: the flood. He actually attempted to kill everyone on Earth (of course there is no evidence for this Flood ever happening, but we'll ignore that part as well for now) and He had no qualms about doing it.
What was the point of this? God got upset that the beings he created were doing evil things (keep in mind, he programmed them to do evil things in the first place via "free will") and wanted to kill them all. That's the bottom line. No "benevolent" ruler murders his own subjects.
"Yahweh decides to flood the earth because of the depth of the sinful state of mankind."
Exodus 15:3 The LORD is a
man of war: the LORD is his name.
Exodus 22:20 He that sacrificeth unto any god, save unto the LORD only,
he shall be utterly destroyed.
Your God would make a lot more sense if you stopped calling him benevolent, because he's clearly not. He's actually more malevolent than most deities.