Only if you are a sinner is Christianity the correct path to follow. For those that are perfectly righteous, and are capable of saving themselves, Christianity is not necessary.
If you believe that you have an unlimited amount of lifetimes to spare, then the crystal-clear logic, rationalism and faultless compassion of Buddhism may indeed be a better path. However, for those of us whose traditions and experiences have led us to believe that this life only is our gift, Christ's sacrifice has already freed us from our Karma of our evil deeds, and for that we can be grateful.
For Moslems that are convinced of their own essential goodness and their ability to make the correct choices, Christ's sacrifice is not needed. They and their Jewish brethren have the Law. Their salvation lies in their ability to follow that Law impeccably. For the Christian sinner, however, who realises how far short his or her own behavior falls of even man's imperfect laws, then Christ's path becomes the most rational one to follow.
For athiests, whose very existence is limited to the material plane, salvation itself is a meaningless concept. Friends and family and entertainment are enough, and if not, well then c'est la vie, because that is all there is. Those of us whose goals transcend us, however, are left unsatisfied. We long to drink of the water that eternally quenches our thirst, and eat of the bread that leaves us perpetually fulfilled.
This was the promise of the one who, according to his contemporaries, was raised from the dead.
With the empty tomb ,then, serving as both proof and fulfillment of a the Biblical tradition stretching back through the millenia, we sinners, who are in need of salvation, can be confident in the promise that Christ himself has made.
