So then it is not of him that willeth, nor of him that runneth, but of God that sheweth mercy. – Romans 9:16
For by grace are ye saved through faith; and that not of yourselves: it is the gift of God… – Ephesians 2:8
Some imagine that faith comes by hereditary descent, and they act upon the supposition. Hence, in certain churches, birthright membership is thought to be a proper practice, and the child of a Christian is thought to be a Christian. In some other churches, though the theory would not be stated in so many words, yet it is practically accepted, and children of pious parents are regarded as scarcely needing conversion. The text is forgotten which saith that the heirs of salvation are born, “not of blood, nor of the will of the flesh, but of God.” The typical covenant secured outward privileges to the children born after the flesh, but under the covenant of grace the blessing is secured to the spiritual and not to the natural seed. “He who was of the bondwoman was born after the flesh; but he of the freewoman was by promise.” (Galatians 4:23). That which is born of the flesh is flesh, and nothing more: the new-born nature is not transmissible from father to son like a natural temperament or a cast of countenance. I know the answer will be that “the promise is to us and to our children,” but it will be well for the objector to reply to himself by completing the quotation—”even to as many as the Lord your God shall call.” The fact is, that nothing spiritual is inherited by carnal generation. Our children, even if we are far advanced in grace, will still be “shapen in iniquity.” No matter how high the sainthood of the professing Christian, his child (when capable of understanding) must for himself become a personal believer in Jesus.