Caillet, son of atheist parents and an avowed enemy of the Church from youth was entered into a Lodge of Grande Orient of France in 1969 at the age of 35 years in Rennes. It is one of the oldest and most powerful Lodges. He remained there until the 18 Degree of the Rosicrucians. He was then given access to the higher degrees of the Scottish Rite, which are unknown to most Masonic brethren of lower grades. Caillet was interested in the occult, white magic and divination. He was among the French pioneers of family planning in the 70s, and fought for the distribution of artificial contraceptives and the legalization of the killing of unborn children. As a member of the Socialist party and friend of President Mitterand as chair he experienced as master of his lodge an explosive interest in lodge membership after his election. It was also possible for the aspiring master to experience first hand the influence of the Lodge brothers in politics, media, business and public service.
In 1984 he accompanied his sick wife to Lourdes where his life took a radical turn. When he first witnessed a Mass in his life, he heard a "soft voice calling me, and not the voice of my conscience, it was still an outer voice. The voice called me by my name and said to me: It is good that you ask me to cure your wife. But what you have to offer me?” At that moment, he offered himself to himself. "It was everything I had to offer. Not a little to be an atheist, who was for 40 years a Church and priest-hater,“ said Caillet in one of his books was about the event at the beginning of his conversion. Today, he is an honorary member of the Alliance Vita, which advocates for the protection of unborn life. Caillet committed today are active against divorce, gay marriage, euthanasia, and the lethal drug injection, because he “is to defend the perfect order of God, against the destructive plans of Freemasonry.”