Deep down in the Christian's life, always and all the time, there is to be a "no" to every demand that the flesh may make for recognition, and every demand that the flesh may make for approval, and every demand that the flesh may make for vindication. Always the Christian must bear about in his body the marks of the Lord Jesus.
They all err - Muslims, Christians, Jews and Magians. There are two kinds of humans - the intelligent, who have no religion, and the religious, who have no intellect.
Religion is still useful among the herd - that it helps their orderly conduct as nothing else could. The crude human animal is in-eradicably superstitious, and there is every biological reason why they should be. Take away his Christian god and saints, and he will worship something else.