Imprudent fervour is the fault common to both belief and unbelief

 

One would fancy that infidels would be exempt from that single fault, which seems to grow out of the imprudent fervours of religion; but so it is, that infidelity is propagated with as much fierceness and contention, as if the safety of mankind depended upon it.

-- Joseph Addison's Spectator

The Devil's Dictionary definition of "infidel"

Infidel

n. In New York, one who does not believe in the Christian religion; in Constantinople, one who does. 

The progress of religion?

Judaism is replete with sacrificed animals.

Christianity is obsessed with the sacrificial death of one man.

And now Islamists want to fill the world with the blood of all infidels.

It's regressive revelation, not progressive.

 

For I desire steadfast love and not sacrifice, and the knowledge of God rather than burnt offerings.

-- Hosea 6:6 

Come out from among them: Separation is the very definition of holiness, not unity

Robert Browne, the first seceder

"Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? And what concord hath Christ with Belial? or what part hath he that believeth with an infidel? And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people. Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you, And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty. Having therefore these promises, dearly beloved, let us cleanse ourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God."

-- 2 Corinthians 6:14ff.