Both a product of his times and a producer of his times, Voltaire was a Deist- albeit with an iconoclastic perspective and attitude. To say the least, he was not a supporter of organized religions and had many harsh yet witty words directly about Christianity which I purposely did not include here.
Below are many Voltaireisms:


"The truths of religion are never so well understood as by
those who have lost the power of reasoning."

"Common sense is not so common."

"Doubt is not a pleasant condition, but certainty is absurd."

"Faith consists in believing when it is beyond the power of reason to believe."

"God is a comedian, playing to an audience too afraid to laugh."

"I do not agree with what you have to say, but I'll defend to the death your right to say it."

"I have never made but one prayer to God, a very short one: "O Lord make my enemies ridiculous." And God granted it."

"Man is free at the moment he wishes to be."

"No problem can withstand the assault of sustained thinking."

"Nothing can be more contrary to religion and the clergy than reason and common sense."

"One great use of words is to hide our thoughts."

"Prejudices are what fools use for reason."

"Superstition is to religion what astrology is to astronomy the mad daughter of a wise mother. These daughters have too long dominated the earth."

"The very impossibility in which I find myself to prove that God is not, discovers to me his existence."

"I hate women because they always know where things are."