Nowhere does the Book of Romans state that babies are sinful or under condemnation for the sin of another. You just engaged in what you are trying to speak against in your OP.
Romans is not a text in isolation but is rather a presentation consistent with many references to the Old Testament.
An example...
Rom 3:10 As it is written, There is none righteous, no, not one:
Rom 3:11 There is none that understandeth, there is none that seeketh after God.
Rom 3:12 They are all gone out of the way, they are together become unprofitable; there is none that doeth good, no, not one.
Many theologians will quote that verse as a proof text that no-one is in fact righteous and that this therefore substantiates the necessity that the literal righteousness of Jesus must be forensically imputed to the account of those who can never be righteous otherwise.
Yet Rom 3:10 is a reference to the sentiment expressed in...
Psa 14:1 To the chief Musician, A Psalm of David. The fool hath said in his heart, There is no God. They are corrupt, they have done abominable works, there is none that doeth good.
Psa 14:2 The LORD looked down from heaven upon the children of men, to see if there were any that did understand, and seek God.
Psa 14:3 They are all gone aside, they are all together become filthy: there is none that doeth good, no, not one.
Psa 14:4 Have all the workers of iniquity no knowledge? who eat up my people as they eat bread, and call not upon the LORD.
Psa 53:1 To the chief Musician upon Mahalath, Maschil, A Psalm of David. The fool hath said in his heart, There is no God. Corrupt are they, and have done abominable iniquity: there is none that doeth good.
Psa 53:2 God looked down from heaven upon the children of men, to see if there were any that did understand, that did seek God.
Psa 53:3 Every one of them is gone back: they are altogether become filthy; there is none that doeth good, no, not one.
A sentiment presented within the context of those who "reject God." Romans 3:10 is also presented within the context of Paul comparing the Jews to the Gentiles that both bodies of people are guilty of iniquity before God. Paul is not categorically teaching that babies are born sinners or that all people are under condemnation save a foreign judicial imputation of the righteousness of another.
Likewise...
Rom 5:12 Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
Rom 5:13 (For until the law sin was in the world: but sin is not imputed when there is no law.
Rom 5:14 Nevertheless death reigned from Adam to Moses, even over them that had not sinned after the similitude of Adam's transgression, who is the figure of him that was to come.
The above text is often used to prove that sin is literally passed down from parent to child and thus implies that babies are born sinners and therefore already guilty before God. Yet the text actually states that death is passed upon all men for all having sinned (not sinned "in Adam" as the Latin Vulgate erroneously states which is where Rom 5:12 was originally abused).
Rom 5:12 is not an isolated proof text but is written within a contextual framework of thought. Rom 5:12-14 cannot be separated from the sentiment of...
Rom 7:8 But sin, taking occasion by the commandment, wrought in me all manner of concupiscence. For without the law sin was dead.
Rom 7:9 For I was alive without the law once: but when the commandment came, sin revived, and I died.
Rom 7:10 And the commandment, which was ordained to life, I found to be unto death.
Rom 7:11 For sin, taking occasion by the commandment, deceived me, and by it slew me.
Death (to God) is passed onto all men when all men actually sin. Physical death is passed down from Adam not spiritual corruption. Likewise there is sentiment expressed in...
Rom 2:11 For there is no respect of persons with God.
Rom 2:12 For as many as have sinned without law shall also perish without law: and as many as have sinned in the law shall be judged by the law;
Rom 2:13 (For not the hearers of the law are just before God, but the doers of the law shall be justified.
Rom 2:14 For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:
Rom 2:15 Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another
One can do by "nature" do that which is in the law which is a direct contradiction to those who would use Rom 5:12 as a proof text that one is by nature evil to begin with.
Many theologians will also take this verse...
Rom 5:19 For as by one man's disobedience many were made sinners, so by the obedience of one shall many be made righteous.
...and use it as a proof text that babies are automatically born sinners due to the conduct of Adam.
The sentiment of Jesus Christ utterly contradicts such notions of automatic sinfulness and automatic righteousness. Jesus was an example for people to follow, an example of an individual who walked in the Spirit of God. An example that people could follow and by doing so escape the corruption of this world. More than that Jesus was a propitiatory offering presented to God on our behalf whereby our former rebellion (having come to repentance) can be washed away whereby we can have fellowship with God through Jesus.
What the wolves in sheeps clothing do is isolate and proof text select passages out of context in order to establish Jesus Christ as a substitute for personal obedience and conduct. Hence, in their minds, reconciliation to God through Jesus Christ is based on a "substitutional provision" as opposed to a "transformation of the heart." They have taken the "transformation of the heart" and appended as something that may or may not happen sometime in the future which effectively serves to deceive people who remain dead in their sins into believing they have been reconciled to God. A masterful deception if I ever saw one.
