Let's Give The Muslims A Day Off

[Mudhammam]

Why do you say that?

For one, most of the secularists throughout the Enlightenment were raised in the Church, so many of their values were shaped by principles they had been taught as children. This includes the idea of universal human rights, whether because we are endowed with them by a Creator or because of the rationale of the Golden Rule (I'm not claiming that the Golden Rule is original with Christianity, but it certainly was its most important promotional tool). This was not an idea you found anywhere in the ancient world until Christianity:
"There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus." - Paul in Galatians.
Separation of church and state also had a basis in the teachings of Jesus:
"Render that which is of Caesar unto Caesar, and that which is of God unto God."
Those are two extremely important aspects of modern-day secular ethics that Christianity had a dominant role in shaping.