A Brooklyn church worker was busted for sexually abusing a 10-year-old boy and is being eyed in more than a dozen other cases of molestation, law-enforcement sources said.

Angelo Serrano, 58, of Fort Greene, allegedly fondled the boy, a family friend, at the victim’s Williamsburg home in August. The child recently reported the alleged incident to his parents, who then called police.

Serrano — who neighbors said taught Sunday school at St. Lucy’s Church near his home — was arrested Thursday night, according to police sources.

Under questioning, the suspect allegedly admitted to fondling more than a dozen other young boys.

It was unclear if any suspected attacks occurred at St. Lucy’s. A Brooklyn Diocese spokesman did not return a call for comment.