Children of believers are not sent to heaven or specially favored by God because they’re children of believers. It is no doubt a great blessing to have faithful parent(s). But it does not place one in a Covenant of Grace with God or grant special covenantal privileges. John 1:13 says that the children of God “were born, not of blood nor of the will of the flesh nor of the will of man, but of God.” They are reborn by the will of God. It is the children of promise, not of the flesh who are heirs of salvation (Rom. 9:8). Therefore, if God has decided to choose between infants who would go to hell and those who would go to heaven, I don’t see any reason for believing parents to have confidence that their child is with God just because they’re believers. Plus, God does not punish the sin of the parents (e.g., unbelief) on the children (Ezek. 18:20; Deut. 24:16), rather, everyone pays for their own sins. Therefore, in this case, unbelieving parents could also have confidence (but unbelievers want nothing to do with the true God) that their children may be with God. The consequences of sin may come upon more generations, but the sin of the father is not imputed to the son. Therefore, I believe that God will not consider the sin of the parents in making His choice, otherwise, it would not be free in the highest sense as in Romans 9:11 (see above).
The Lord was angry with the generation of the Israelites in the wilderness who continually tempted Him. He promised that they shall not enter into His rest (Heb. 3:16-19). The Lord promised that “Not one of these men of this evil generation shall see the good land that I swore to give to your fathers” (Deut. 1:35). The Lord waited 40 years until that generation completely died out (Num. 32:13). Yet, in Deuteronomy 1, the Lord answers the concern of this “evil generation” about their children. The Lord said, “And as for your little ones, who you said would become a prey, and your children, who today have no knowledge of good or evil, they shall go in there. And to them I will give it, and they shall possess it” (Deut. 1:39). The Lord denied the blessings to the fathers, yet granted them to the children. They are described as those who “have no knowledge of good or evil”. This means that they are not mature enough to understand and act upon that understanding as their parents were. Notice also that the description of “have no knowledge of good or evil” is directly attached to “your children” and “your little ones”. It is not spoken of those who are of age and understanding. Dr. Albert Mohler writes:
We believe that this passage bears directly on the issue of infant salvation, and that the accomplished work of Christ has removed the stain of original sin from those who die in infancy. Knowing neither good nor evil, these young children are incapable of committing sins in the body – are not yet moral agents – and die secure in the grace of our Lord Jesus Christ.[6]
This passage would serve as an indication that God’s mercy and grac...