Paul's sentiments towards the nation of Israel give us a good model.
Brothers, my heart's desire and prayer to God for them is that they
may be saved. Romans 10:1 ESV
Our desire and prayer to God for the Church of Satan should be that they may be saved. According to the Scriptures, they are living a lie, they are deceived, and they are blind to the reality. People can certainly have "good times", but we were created to know God.
In their case the god of this world has blinded the minds of the
unbelievers, to keep them from seeing the light of the gospel of the
glory of Christ, who is the image of God. 2 Corinthians 4:4 ESV
If we were temporal beings, then temporal pleasures would be our highest goal. But we are not temporal beings. Since we are beings with immortal souls, if all we ever experience are temporal pleasures, we should be pitied. We were created to know God eternally and experience the eternal pleasures of that relationship.
You make known to me the path of life; in your presence there is
fullness of joy; at your right hand are pleasures forevermore.
Psalm 16:11 ESV
Hell will be no party or place of pleasure. That's part of the deceit. So, we should have great compassion and concern for those in the Church of Satan, despite any perception that they have good times or harmless fun.