Roth was born on June 13, 1948 to Frances and Lawrence Roth. He has stated that his Jewish family faced various forms of harassment growing up in a heavily Catholic part of Long Island, New York. This involved incidents like "a cross being burned on the lawn and some of Roth's schoolmates crossed themselves before they would speak to him." In 1959, Roth's father volunteered his son to be a plaintiff in the ACLU's effort to abolish mandatory prayer in public schools. The case, filed in New York, went through several appeals, finally reaching the U.S. Supreme Court in 1962. The Court ruled that such prayer was unconstitutional under the First Amendment, in the landmark case of Engel v. Vitale.
Roth attended Boston University, graduating in 1970 with a bachelor's degree in communication.