This is really a very provocative question. I stated some of my beliefs, or lack of them, in an earlier post, but it was too simple an answer, and I'm always continuing to think about stuff like this. My two favourite people on the planet, outside my own family, are Jews, but they're cultural Jews, not religious Jews. The husband of that pair, for instance, and my best friend, is an atheist as I am, while his wife, my second-best friend, is still a fence-sitter on that question, as is my own wife. But they do celebrate the major Jewish festivals, with good reason. I've been to Seder celebrations at their home many times (like every year for the past 15 years), and apart from the religious content they're really a celebration of endurance and triumph over adversity, which seem to me to be things well worth celebrating. And the admonitions that are part of the ceremony, best typified by the requirement to care for the stranger among you "because you too were once strangers in the land of Egypt, " seem to me to represent all that is best and most noble in human nature. That couple and their children have also been guests in our home for Christmas dinner at least as often as we've been guests at their Seder celebrations, and they understand Christ's message of inclusion, acceptance, and forgiveness at least as well as we do. Can you ask for better than that? No, I don't think so.
But after so many years, they're not really guests in our home, and we aren't really guests in their home. We're all family to some degree. We don't knock on their door or ring the bell, as they don't at our door, we just walk in and shout "Hi, we're here," and so do they. Again, can you ask for better than that?
Nope.