Letrs look at these again....
Romans 5:12: "Therefore, just as sin entered the world through one man, and death through sin, and in this way death came to all men, because all sinned--"
Romans 5:13: "for before the law was given, sin was in the world. But sin is not taken into account when there is no law."
Romans 5:14: "Nevertheless, death reigned from the time of Adam to the time of Moses, even over those who did not sin by breaking a command, as did Adam, who was a pattern of the one to come."
Romans 5:15: "But the gift is not like the trespass. For if the many died by the trespass of the one man, how much more did God's grace and the gift that came by the grace of the one man, Jesus Christ, overflow to the many!"
What the above passage actually says. Verse 12 says that sin entered the world through Adam, and death through sin, and death spread to all men because all sinned. Verse 14 says that death reigned from Adam to Moses, and verse 15 says that by the one man's offense many died, and so on. When people argue that this passage means that we were all born spiritually dead, they're assuming that these verses are referring to spiritual death. However, many Bible scholars interpret the above passage as meaning physical death, which is why this passage is often used to refute evolution (because the above passage says that there was no death before the Fall, which contradicts the theory of evolution). But for the sake of discussion, let's pretend that Paul was referring to spiritual death. Notice that the above passage does not say that we are born in a spiritually dead state. If Paul was referring to spiritual death, then all he said was that spiritual death came because of sin, and that spiritual death spread to all people because everyone sins. This doesn't prove the argument that we are born spiritually dead, it simply means that at some point we become spiritually dead. In fact, if Paul was referring to spiritual death in the above passage then notice that verse 15 specifically says that "many died," which indicates that they were spiritually alive but then they became spiritually dead, which is exactly how Paul described himself in Romans 7:9 (as we saw earlier). So this passage does not prove that infants are born spiritually dead.