Write a long, nasty, mean-spirited letter to explain everything that they dislike about the church and articulate their own self-pity at length. I would not leave in a hurry.If you do, write a letter explaining your reasons, then leave. Entering into, engaging with, and departing from Christ's local body is a significant part of following Jesus. Keep your former church in your prayers and speak well of it. Tell the pastor you are leaving. This may be the most important point. I did leave, and am now in a new place much better for me. Thank you, thank you, for all you've done, for your sweet heart for the Lord and for your neighbors. We love each of you so much, and are very sad to say goodbye.