"No matter what our faith or belief system, we are all sinners against God's law, period."
This is exactly true, and why the bible says we need Christ.
God requires perfection, yet we could not be perfect. We would have no hope to satisfy God's requirement of perfection had not Christ came to take our place, take our sins upon Himself, and suffer God's wrath on our behalf.
These are the truths of the bible, and we either believe them or we do not.