"Either way, it doesn't seem like anyone is going to debunk my points"
Yiffzer
Going back to the topic of Inherent Sin, your issue is that it was not a Jewish Concept at the time, and that within the Christian Bible it is only mentioned in Romans. (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— 13for before the law was given, sin was in the world. But sin is not taken into account when there is no law. 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.
18 Consequently, just as the result of one trespass was condemnation for all men, so also the result of one act of righteousness was justification that brings life for all men. 19 For just as through the disobedience of the one man the many were made sinners, so also through the obedience of the one man the many will be made righteous
That's the simple answer to your question. The Christian Bible, specifically in Romans, says that through one individual's Sin, all were made sinners. 'ALL' were made sinners.
Genesis 8:21
21 The LORD smelled the pleasing aroma and said in his heart: "Never again will I curse the ground because of man, even though every inclination of his heart is evil from childhood. And never again will I destroy all living creatures, as I have done. NIV
...for the imagination of man's heart is evil from his youth. KJV
...even though every inclination of his heart is evil from childhood. NASB
Man's heart is evil from youth. That's Old Testement. Christians may disagree philosophically, however, you have not presented scripture that conflicts, and I have a feeling that's what you are really trying to get at.
"No one could challenge the position of my points. Are they admitting that Christianity isn't that perfect?" - Yiffzer
The idea of Original Sin is not contrary to scripture.
Your points have not offered scripture to refute what is stated in the Bible. It is Agreed that there are only a few verses. It is Agreed that it wasn't spoken by Jesus. It is Agreed that it is not an overt Jewish belief. However; the belief that all are born sinners is not contrary to scripture.
I will agree that Christians aren't perfect. I will agree that some divine concepts may be beyond human understanding. Christianity isn't perfect?
Define Christianity?
If Christianity is an expression of how an individual worships, experiences, and follows Jesus, how can someone claim that one person's experience is better than another's?
Catholics, Baptists, etc? Who has it perfect?
Christianity isn't so much about following rules, or doing specific things (although some are important). It's about a relationship with Jesus. What Jesus did for us is perfect. How we respond to him, will it be perfect? Is that what you are trying to Judge?
Do all Christians Agree on issues? If they do not, does Christianity fail?
Baptism
Mark 16
15 He said to them, "Go into all the world and preach the good news to all creation. 16Whoever believes and is baptized will be saved, but whoever does not believe will be condemned.
(Jesus speaking)
Whoever believes and is baptized will be saved.
Whoever does not believe will be condemned.
Notice that baptism and belief are connected in the first statement, but not the second. Belief is required for salvation, but baptism is an expression of that belief. It is not Baptism that saves, only belief, and if you don't believe you will be condemned.