Just my view
Some laws are general irrespective of religion

Laws based on morals and the law of success. I believe the laws of success are universal and will walk for anyone who applies it. There is a story on the net about Dangote honoring Idahosa while traveling on a plane by exchanging seat with him. Although we cant say this was the source of his wealth but am highly sure contribute to his success. This is simple principles that go beyond religion.
Morals are also universal like don't do this and don't do that but the problem is you can't be 100% moralist because you will surely come short of a moral value.

I think the problem comes when we start using MEN as a yardstick of Christianity, as men we are subjected to one error or the other and we all are just working out our salvation. If you keep looking at men the more you will tend not to believe in God because the ways of men are wicked. And the fact remains that there are more bad men than Good men, but there are still Good men who are still doing and following the heart of God.