Satan was created by God as all other angels were created by God.
Psalm 148
1 Praise the LORD.
Praise the LORD from the heavens,
praise him in the heights above.
2 Praise him, all his angels,
praise him, all his heavenly hosts.
3 Praise him, sun and moon,
praise him, all you shining stars.
4 Praise him, you highest heavens
and you waters above the skies.
5 Let them praise the name of the LORD,
for he commanded and they were created.
. . .
As I said: Weird! So you see, it is easy to criticize others and not look closely at oneself.