I know many people who are morally good, but fail to believe in God, even though they try to do so. What about them?
Who says they are good? Certainly NOT the Bible:
Romans 3:10-12 English Standard Version (ESV)
10 as it is written:
“None is righteous, no, not one;
11 no one understands;
no one seeks for God.
12 All have turned aside; together they have become worthless;
no one does good,
not even one.”
Luke 18:19 New King James Version (NKJV)
19 So Jesus said to him, “Why do you call Me good? No one
is good butOne,
that is, God.
Ecclesiastes 7:20 New King James Version (NKJV)
20 For
there is not a just man on earth who does good
And does not sin.
Psalm 14 English Standard Version (ESV)
The Fool Says, There Is No God
To the choirmaster. Of David.
14 The fool says in his heart, “There is no God.”
They are corrupt, they do abominable deeds;
there is none who does good.
2 The Lord looks down from heaven on the children of man,
to see if there are any who understand,[
a]
who seek after God.
3 They have all turned aside; together they have become corrupt;
there is none who does good,
not even one.
There are PLENTY more.