Answering the "problem of evil/suffering" charge made against the God who is love is often seen by Christians as a great difficulty.
How do we explain how the God who people understand to be 'all-powerful' (omnipotent), "all-loving" (omnibenevolent), and "all-knowing" (omniscient) can also allow we his creatures in his image to experience suffering and to do evil.
For a start, lets get rid of the philosophical terms, and stick with the Bible, the 'all' descriptions seem to place evaluative criteria over God, instead of seeking to understand the God who is: Yahweh. We end up with the 'god of the philosophers' instead of the living God.
So, there's a disjunct between what we would like, or think our experience indicates and the world as we would like it to be, or how we think God has or 'should have' arranged things...mainly for our comfort, it would seem.
But why?
First, God created us for (a) meaningful fellowship with him, see Genesis 3:8a; and to take charge of the creation (Genesis 1:26ff...and I'm still puzzled about ruling over the fish!!). See also Psalm 115:16,
Then we, in Adam, rejected fellowship with God and sought to live in opposition to him; with that our stewardship crumbled.
Rather than destroy all, because God still had the objective of fellowship with us, he provided the resolution of this adversity in Christ: we can be in Christ renewed and restored to fellowship with God, and adopted into his family! But that's in the future, nevertheless, despite adversity in life, we are now in Christ, and our suffering is in that context.
Nevertheless, God in Christ meets us in that suffering: he meets us where we are and calls us to him. Our only sensible response is to believe him and turn to him in repentance.
The basic answer to the 'problem' is Luke 13: repent! Sounds glib, but the reason for suffering is like the reason for a fire alarm in a high-rise: get out while you can. Without suffering the consequence of a world disconnected from its creator we would not know our plight.
Furthermore, one of the 'functions' of suffering (and evil) may be to tell us/show us who we actually are, inescapably! Someone said, it may have been Frankel, that the Nazi guards at death camps were ordinary people, just like us! (Or it might have been Solzhenitsyn, and different guards.) We should all remember, 'but for the grace of God go I' To put another complexion on that saying.