Atheist Bible Study 1: Genesis

[tackattack]

Are you really arguing against me when I was actually agreeing with you? People are sinful by nature because of original sin.

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It's explained very easily in Romans 2 and 5
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;
13 (For not the hearers of the law are just before God, but the doers of the law shall be justified.
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:
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
AND
12 Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men[e] because all sinned— 13 for sin indeed was in the world before the law was given, but sin is not counted where there is no law. 14 Yet death reigned from Adam to Moses, even over those whose sinning was not like the transgression of Adam, who was a type of the one who was to come.
15 But the free gift is not like the trespass. For if many died through one man's trespass, much more have the grace of God and the free gift by the grace of that one man Jesus Christ abounded for many.

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I agree no one was righteous from that place 100% I also agree it was a mercy that He saved Lot. But as highlighted above, those before the law still had the law on their hearts, all had sinned, and sins aren't differentiated without the law.
In fact just go read Romans 3 and 4. They speak directly to justification of Abraham and original sin.