Christians should tell their children about the amazing miracles he performed in the Bible and tell them about the miracles that have happened personally.

Psalm 78:

My people, hear my teaching;
listen to the words of my mouth.
2 I will open my mouth with a parable;
I will utter hidden things, things from of old—
3 things we have heard and known,
things our ancestors have told us.
4 We will not hide them from their descendants;
we will tell the next generation
the praiseworthy deeds of the Lord,
his power, and the wonders he has done.
5 He decreed statutes for Jacob
and established the law in Israel,
which he commanded our ancestors
to teach their children,
6 so the next generation would know them,
even the children yet to be born,
and they in turn would tell their children.
7 Then they would put their trust in God
and would not forget his deeds
but would keep his commands.
8 They would not be like their ancestors—
a stubborn and rebellious generation,
whose hearts were not loyal to God,
whose spirits were not faithful to him.