Are demons saved?

1 John 4:15 says:

"Whosoever shall confess that Jesus is the Son of God, God dwelleth in him, and he in God."

Then in Mark 1:23-24 we read the demons crying that Yeshua is the Holy One of God:

"Just then there was a man in their synagogue with an unclean spirit; and he cried out, saying, 'What business do You have with us, Jesus of Nazareth? Have You come to destroy us? I know who You are—the Holy One of God!'"

How do you bring these verses together for an unbeliever?