WASHINGTON—The new Congress will, for the first time, include a Muslim, two Buddhists, more Jews than Episcopalians, and the highest-ranking Mormon in congressional history.

Roman Catholics remain the largest single faith group in Congress, accounting for 29 percent of all members of the House and Senate, followed by Baptists, Methodists, Presbyterians, Jews and Episcopalians

While Catholics in Congress are nearly 2-to-1 Democrats, the most lopsidedly Democratic groups are Jews and those not affiliated with any religion. Of the 43 Jewish members of Congress, there is only one Jewish Republican in the House and two in the Senate. The six religiously unaffiliated members of the House are all Democrats.

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Evangelical Christians—a category that cuts across denominational lines—are [...]underrepresented, according to Furman University political scientist James Guth, all the more so after this year’s defeat of Republican incumbents like Reps. John Hostettler of Indiana and Jim Ryun of Kansas.