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If a monotheistic God himself created evil and is the prime cause of evil, then he may be omniscient and omnipotent, but not infinitely benevolent.

he did not.

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If God lacks the foreknowledge needed to stop evil events from occurring, then he may be omnipotent and benevolent, but not omniscient.

he lacks not.

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If God cannot stop evil, then he may be omniscient and benevolent, but not omnipotent.

He did already. what you forget in your calculation is the free will of men, given by god.

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Evil exists, as you will observe.

For a while.

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Thus, God himself wills it—and/or God is powerless to intervene against it—and/or God does not know the future, such that he can stop evil from occurring.

Do not fret because of those who are evil
or be envious of those who do wrong;
for like the grass they will soon wither,
like green plants they will soon die away.

Trust in the Lord and do good;
dwell in the land and enjoy safe pasture.
Take delight in the Lord, and he will give you the desires of your heart.

Commit your way to the Lord;
trust in him and he will do this:

He will make your righteous reward shine like the dawn,
your vindication like the noonday sun.

Be still before the Lord
and wait patiently for him;
do not fret when people succeed in their ways,
when they carry out their wicked schemes.

Refrain from anger and turn from wrath;
do not fret—it leads only to evil.

For those who are evil will be destroyed,
but those who hope in the Lord will inherit the land.

A little while, and the wicked will be no more;
though you look for them, they will not be found.
But the meek will inherit the land
and enjoy peace and prosperity.

The wicked plot against the righteous
and gnash their teeth at them;
but the Lord laughs at the wicked,
for he knows their day is coming