I agree with most of what you say about God leaving us standing on the side of the road, etc., but I cannot agree with what Epicurus said because it is illogical and inane.
Why should God prevent the evil that people cause owing to the free will choices that they make?
To say that God is omnipotent so God could prevent all evil is completely irrelevant.
There is no reason God should or would do everything He is capable of doing.
Since we have free will to choose good or evil, it is our responsibility to choose good over evil.
No court of law ever held God responsible for a murder that was committed by a man or woman.
"Is he able, but not willing? then is he malevolent."
That is so inane. Why should God be "willing" to do what humans think He should do, as if humans could ever know more than an omniscient God regarding the best course of action. God is not a short order cook. Basically he is saying the God is malevolent because He does not hop to and do what I think He should do, take responsibility for what evil people do and prevent their evil choices from being acted out. That would not solve anything because those people would still be evil people. And how would that pay out in the real world? God would either have to take their free will to act away or all people who would potentially commit evil acts would have to be put in prison, before they even committed any crimes.
"Is he both unable and unwilling? Then why call him God?"
I would call Him God if He is able but unwilling to do what humans want Him to do, because an omnipotent God never does
anything He does not choose to do, period. If what God choose to do aligns with what humans want Him to do, that is only because God chose to do it. The following three quotes sum up what it means to be an omnipotent God.
“God witnesseth that there is no God but Him, the Gracious, the Best-Beloved. All grace and bounty are His. To whomsoever He will He giveth whatsoever is His wish. He, verily, is the All-Powerful, the Almighty, the Help in Peril, the Self-Subsisting.” Gleanings, p. 73
“Say: O people! Let not this life and its deceits deceive you, for the world and all that is therein is held firmly in the grasp of His Will. He bestoweth His favor on whom He willeth, and from whom He willeth He taketh it away. He doth whatsoever He chooseth.” Gleanings, p. 209
“Say: He ordaineth as He pleaseth, by virtue of His sovereignty, and doeth whatsoever He willeth at His own behest. He shall not be asked of the things it pleaseth Him to ordain. He, in truth, is the Unrestrained, the All-Powerful, the All-Wise.” Gleanings, p, 284