I'm thinking of setting the church on fire.
What did the church do? Why would you want to burn the church down?
1. I don't have a meaningful belief anymore and I feel uneasy in church
Setting a church on fire or any building is dangerous and wrong. If you have issues with church you just do your best to avoid it. Going around setting the church on fire is only a land you in jail.
2. I hear that there is valuable artwork that can be pawned for a lot of money.
But defacing and destroying such a holy building would make you look like a bad person to the community. If you really dislike the church, why not just quit it instead of defacing and stealing from it? You will be forgiven way easily this way.