Multiculturalism
There is a saying, that moderation is the best of all ways, that extremes, except for short periods of reform, are detrimental to well-being and good of both individuals and society. For indeed moderation most promotes people walking together, and thereby the orderly establishment of Truth and progress in the world, with most benefit and fewest people hurt. The Qu'ran itself says to take the Middle Way (e.g. 35:32), as do all other religions.
We live in an era where individualism is taken to such an extreme, that we live as isolated individuals surrounded by thousands of strangers. Even in our homes we know scarely anyone on the street, and of those we do know, not to any real depth. This is far out of balance from what is meant by the Middle Way. So, too, the approach to Diversity has a tendency to adopt this same extreme approach in its promotion of multiculturalism.
On the one hand, Conformity taken to its conclusion, leads to oppression and stagnation, whilst Diversity taken to its conclusion leads to chaos, confusion, lack of support and friction.
What is required is "integrated diversity", where unity and diversity are in a mutually-nurturing balance.
Take for example, the human body. All the organs are different - they display great diversity - but they are all integrated and work together, living off the same blood and living in the same overarching system, communicating with the same brain. This overarching system and commonality of purpose is their unity. In a healthy body, this unity and diversity is in balance. If all the organs were diverse, but not integrated, then there would be chaos in the body and the person would die within hours or days.
So too with spirituality and faith. If you and your neighbour go to separate places of worship, you have no joint spiritual fellowship. By so doing, you are asserting that your spiritual differences are more significant than your togetherness. A christian goes to one church, and his next-door neighbour christian goes to a different church. As christians, they should join in spiritual fellowship together in one church, along with the rest of their village, that the village or street may be bonded in fellow-feeling, and their togetherness be more significant than their differences. A village whose members are all traveling to different spiritual fellowships, is disunited; it is a village that lacks a single fellowship, and it will not grow spiritually to its fruition. Or if a Sikh is neighbour to a Muslim, the Sikh travels half an hour to his Gurdwara, whilst the Muslim travels half-an-hour in the other direction to his Mosque. This is chaos - spiritual chaos - and where there is spiritual chaos, the material order will be inept and dysfunctional. It is far better for everyone to call themselves either Sikhs or Muslims, and worship at the same place, and that the resulting single spiritual community recognise people's diversity of nuance in their relationship to God, so that all together feel as brothers and sisters in a single family of the spirit. Just imagine if you had to decide what to do with a patch of ground in your village, and half the village went to one meeting to decide, and the other went to a different meeting to decide. The result would be chaos! They must consult, work, laugh and cry together as one, each contributing their individuality to a collective purpose. So too with fellowship. Wherever people work and live together - they should also worship together, whatever their individual persuasions in understanding the divine mystery of the universe.