Okay. We can get mixed up on words a little once in a while. Christianity is the only religion where salvation itself is given by God as a simple and pure gift, if the person accepts it. All other religions that offer salvation have the individual working for it a bit at least.
I find that to be a flaw. A murder, rapist, or mass killer could be a Christian. After killing thousands of people, he/she should still be granted access to heaven where everything is great?
All sin is as detestable as another. There will be no speck of evil in Heaven, and that means we must be 100% clear of sin, and no one is. That means everyone on earth needs Jesus to wash away the sin. It's not a matter of being less dirty than others, it's about being 100% clean.