Two issues are often raised when criticizing Christianity:
Questions about the existence of evil and suffering

An infinitely righteous, holy and perfect being
How could one create a creature capable of sinning?

If God is good and omnipotent
How can you just leave evil alone?

If God is merciful
Why does God allow suffering to occur to humans?

We present a biblical defense of this difficult debate.

We should define freedom as the ability to choose what I want.
The ability to choose without any desire is a natural occurrence, and even God cannot create that kind of thing.
Even God does not have the power of self-creation or spontaneous generation.
God has the power to bring something into existence out of nothingness.
But the term 'state of nothingness' does not mean that He had no intention of doing so.
It cannot be said that someone simply acted out of free choice.
We must ask 'why' he freely chose it.
What led him to choose it freely?
--- From "Chapter 1: The Difficult Problem of Evil"

The reason I emphasize this point is that we, as a culture, tend to think of evil as if it were some independent entity, or something in the water we drink or the air we breathe, or some independent force or power that exists on its own and thus influences our lives and what happens in the world.
So, the first thing we need to talk about in relation to what evil is is what it is not.
It is not something that exists.
Evil does not contain existence.
That is, evil has no ontological status.
Rather, evil is the act of something that exists.
I am something.
What are we?
If I do something bad, then I am doing something evil, and in this case, evil is the action of some being.
It does not exist in itself.
--- From “Chapter 2: The Nature and Origin of Evil”

We don't marvel at God's grace enough.
As Christians, we have a vague idea of ​​grace and think that God should give us grace anyway, but we have forgotten what grace is.
Grace is, by its very concept, voluntary and free, not obligatory.
If there is an attitude that God is obligated to take when dealing with us, it is not grace but justice.
Only by clearly recognizing this difference between justice and grace can we understand how gracious grace is.
Because grace is the most important thing in our relationship with God.
We live by grace.
By grace we have eternal life.
By grace we receive forgiveness of sins.
This is only possible by grace.

--- From Chapter 5, Providence and Evil

When we stand before God on the Day of Judgment and the Book of Life is finally opened, there will be silence in heaven.
We will not be able to make any excuses.
For you will clearly see that God's work is not only amazing, but also entirely righteous, and that there is no injustice in His providence.
Even Christians sometimes find it extremely difficult to trust this.
Especially when we witness pain and suffering, illness and death.
In such cases, it is necessary to remain silent.
Of course, we try to find His way in the Bible, but sometimes we don't find the right answer.
There are times and places when holy silence is needed before God's sovereignty.

--- From "Chapter 7 Suffering and Sin"

If we do not love God, there is no guarantee that everything that happens to us will ultimately be for our good.
If we are not among those who have been called according to God's will, if we actively live against God's will, we should not take comfort in these words.
God's providence is a double-edged sword.
God's providence means that He rules, and God's rule means that His justice is done.
And His justice is done by punishing unrepentant sinners.

--- From “Chapter 10: Those Who Love God”