That's a rather simplistic view. There was no typical "French Revolutionary", hence suggesting that the French Revolutionaries rejected religion is a gross generalisation. Some French Revolutionaries were simply atheists, some were humanists, some were protestants, some were catholics; indeed, some had been priests of the Catholic Church, like Le Bon. Robespierre's view, for example, was a form of deism. The Cult of the Supreme Being was, despite not being christian, still a form of religion, so religion wasn't universally abandoned, despite the de-Christianisation carried out by some fanatics. For more on this, try "The Jacobin Republic" by Bouloiseau.