To say that Jesus is the Way, the Truth, and the Life is not to say that Christians are the only ones with whom God has relationship. As a Christian, I affirm that at-one-ment with God and salvation (in this life and the next) is found in the resurrected Christ. I also affirm, as do the scriptures, that the Spirit of God blows where it wills, and that the moment we think we have a grasp on God's grace, we find it present in the places and people we thought least likely. This is, of course, a result of our sinful self-righteousness and the arrogance of thinking that we might possibly attain to the full knowledge of God in this life. It seems even more odd that we'd think Christians have a corner on God's grace when we accept the obvious truth that Jesus was a Jew himself, and the Father, Son, and Spirit interacts gracefully and mercifully with both non-Jews and non-Christians throughout holy scripture.
The gospel - the good news of God's infinite grace and love for the world - is for all people, not just one religious group. It is a universal gospel. In John's gospel (10:16), we read, "I have other sheep that are not of this fold. I must bring them also. They too will listen to my voice, and there shall be one flock and one shepherd." In the Nest Testament alone, there is an astounding number of non-Jews, and later non-Christians, who respond to Jesus without becoming Jewish or Christian. The Magi - likely from Babylon or Persia and certainly not Jewish - come to honor him. The Roman Centurion (Matthew 8:5-13) is praised for his faith with no indication of a conversion. Likewise with the Canaanite woman (Matthew 15:21-28) whose daughter was possessed by demons. Jesus' interactions with various Samaritans, who were viewed by Jews as worse than dogs - show Jesus' universal understanding of the reaches of God's grace. He even lifts up a Samaritan as better than the Jewish priests and teachers in his well-known parable of compassion (Luke 10:25-37).
Even though Jesus' own ministry was primarily to the Jews during his lifetime, we see him instruct his disciples to spread his love to all nations (Matthew 28:19). Perhaps the most famous post-gospels story of this expansive view off God's grace comes in Acts 10, when Peter is told never to call unclean that which has been made clean. Paul accepted this vision when he wrote, "There is no more Jew or Greek, no more slave or free, no more male or female, but all are one in Christ Jesus."
The story of God's activity through human history appears to me to be the story of an ever-widening embrace of those for whom God's law is written on the heart - whatever there specific creed or theology might be. The risen Christ cannot be contained in creeds or theological abstractions. It's ridiculous and idolatrous to think that we can contain Him, and I would suggest that, the more open to God's grace one's heart is, the more open s/he is to accepting the work of God among people of many faiths and none. While, as a Christian, I would maintain that any reflection of love of God and neighbor (the two commandments which entail all the law) within an individual is necessarily a reflection of Christ, I do not think Christ must be named or even recognized as the one who lived as God in the flesh to be present and active in a person's life.
We should be careful not to make our own theologies the standard by which to judge Christ's activity in the world and with individuals. If we do, we risk making gods of ourselves - the original temptation. Perhaps it is most prudent to commune with Christ day in and day out, and to enjoy the evidence of the Spirit in people of all beliefs and all kinds. "Whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report.....think on these things." We were never told Christ-followers would be known by their beliefs or theologies, but rather, by their love. Wherever there is love, there is God.