We had an enlightening discussion in Sunday School last week on whether belief in Jesus Christ is the only way to God. Most of my classmates stated that belief in Jesus Christ was the exclusive prerequisite for eternal life. They took literally Christ's words: "I am the way, the truth, and the life; no man cometh unto the father but by me." So do I.
I believe that Jesus was not imparting a message of exclusivity, but one of mechanism. Jesus was telling us that no matter how we as humans describe God or what we believe about who God is, we will reach the after life by one conveyance. All will come to God after death through the manifestation of God that is God's word in creation, that is God in action in our dimensional reality, and I believe, is most clearly revealed in Jesus Christ. All have the opportunity to know God and life after death. God doesn't care how we find him, what we call him, only that we do.
As to atheists, I think they are closer to God than they believe. Atheists actively protest the existence of God, but in doing so they confront the concept of God. I think this brings them closer to God than those who are indifferent. In the end, I believe everyone will know God and will be able to choose or reject a relationship with God.
For me, Jesus represents the truest revelation of God and the mechanism by which we reach God no matter what we believe.