WASHINGTON, Nov. 27 — The president-elect of the Christian Coalition of America, which has long served as a model for activism for the religious right, has stepped down, saying the group resisted his efforts to broaden its agenda to include reducing poverty and fighting global warming.

The Rev. Joel C. Hunter, pastor of a Florida megachurch, was named the group’s president-elect in July. He was to have taken over the presidency in January from Roberta Combs, who is also the chairwoman of the Christian Coalition’s board. Mrs. Combs will continue in both positions now.

Over the last few years, Dr. Hunter, senior pastor of Northland Church in Longwood, Fla., has gained a reputation as an evangelical leader seeking to expand the agenda of conservative Christian activists from issues like abortion and same-sex marriage.

In a telephone interview, Dr. Hunter said that although Mrs. Combs had indicated that the organization also wanted to expand its priorities to include the issues that concerned him, the board backed away from such a commitment during a conference call last Tuesday. By the end of the call, Dr. Hunter and the coalition had decided to part amicably, according to both sides.