Yes! I was reading 'The Atheist Pig' comics, and went across a statement in this comic found here.What I realized is that Christains can't be saved, because they'll always sin, and have a sin in which they can not repent from. For there are many sins in the Bible, and most contradict each other! So one, could not do both, or do nothing, so does not matter their choice, they sin. So, I would think that would help people understand that what they believe is wrong.
But, the whole sacrifice of Jesus is because humans are sinners and remain sinners. He took all sins upon himself; his blood covers them. They don't teach that Christians become free of sin, but that they are forgiven for them past, present and future--IF they have accepted Jesus as their savior, that is. I don't believe this, btw, but it is what I was taught.
The only flaw in your logic is when you say you "realized is that Christians can't be saved" . True atheists don't concern themselves with "saving" one's soul...or even having a "soul" for that matter.
One thing the bible said that's science..."From dust you came and to dust you shall return". Sad, but true; here's more accurate, and scientifically provable atheist memes.