Frederick J. Eikerenkoetter II, better known as Reverend Ike, was an American minister and evangelist based in New York City. He was known for the slogan "You can't lose with the stuff I use!" Though his preaching is considered a form of prosperity theology, Reverend Ike diverged from traditional Christian theology and taught what he called "Science of Living."

Prosperity theology is a religious belief among some Charismatic Christians that financial blessing and physical well-being are always the will of God for them, and that faith, positive speech, and donations to religious causes will increase one's material wealth. Material and especially financial success is seen as a sign of divine favor.