I believe religiousness has a positive role to play in human life. It can inspire ethical behavior, give us the feeling (or perhaps the reality) of communing with the absolute, and great art. However religions have contributed to inter- and intra-religious warfare, persecution and anti-scientific thinking. Is there a way to have the good part of religions without the intolerance?
I think there is if we give up the notion that being religious requires one to be a member of a religion. As an alternative approach look at our attitude towards music. We love music, it helps us emotionally connect with other people and provides a glimpse of the transcendent, but we don’t expect our musical tastes to give us an identity. I can be a fan of Mississippi John Hurt and also a fan of J.S. Bach. If you are a fan of one but not the other that’s fine. I may be very sad and disappointed in what you are missing out on if you don’t like either one, but I am unlikely to try to force you to like them, or to claim you like them if you do not. My fandom can be as narrowly or as widely focussed as I wish — so for example I could love Charley Patton and hate Robert Johnson or love all the blues or love just pre-war acoustic blues.
This strikes me as a good model for religion for the human race going forward. If there are religious books or experiences or leaders whom we love we can love them and try to educate others to love them as well. But we would not look to religious membership for an identity, and we would not try to police others so as to get in line with what we love in religion. That way we would get the good of religion without the bad.
I think this perspective goes a long way towards putting to rest fears that Judaism is disappearing. Judaism is not disappearing any more than the blues is disappearing. The messages of Judaism may be more popular among different ethnic groups, and they may be mixed with other traditions, but the central message of Judaism “Do justly, love mercy, and walk humbly with thy God” will not disappear, any more than the blues chord progressions will disappear. It will only become more powerful as it touches more hearts.