For most, a Sunday church service is a moment for peace, worship and reflection — unless Alec Baldwin is in your congregation.

Sources tell us that some of the parishioners at Most Holy Trinity Parish in East Hampton are so sick of Baldwin’s blustering that a group stood up and turned their backs on the hot-tempered star as he gave a reading from the pulpit.

A source told us of the protesting parishioners on July 29: “Alec loves to be the center of attention and often reads from the pulpit, which really annoys some in the congregation. It is so bad that, one recent Sunday, he went up to read, and part of the congregation stood and rudely turned their backs on him.”

The source said, “Even though he has generously given a lot of money to the town, there are people who just don’t like him. He has a need for attention and shows up at every event. When people go to the church, they don’t want to see the movie star up there.”

Another source suggested that those who turned their backs were staunch Republicans who disagreed with outspoken Baldwin’s liberal views.

Baldwin, who has an eight-acre spread in East Hampton, and new wife, Hilaria Thomas, are regular parishioners at the church, of which he’s a generous benefactor. Last year, he donated a set tour of “30 Rock” to a church fund-raising auction.

Rev. Donald Hanson, the pastor, told Page Six, “Alec Baldwin reads from time to time at the church, and read again on Sunday two weeks ago.” Asked about parishioners who turned their backs, Hanson said, “I was told that happened, but I did not personally witness it, as another priest was saying the Mass.”

And about the reason for the public protest, he added, “I am not going to comment, as I wasn’t there.”

A representative for Baldwin said, “Alec was focused on the prayers, so he has no way of knowing if this happened. But does someone violating the sanctity of a church even deserve a response?”