I think churches reflect to a greater extent the community they are in.
It would be an interesting statistic to see the correlation between local churches and the communities they are placed in. I suspect that we would find that every community group in the world, religious and non-religious - more or less - reflects their local community.
It would be different for larger congregations and community organisations which pull from a great distance.
My local tennis club has pretty much the same demographics as my church. And my local little athletics is pretty much the same.
The shopping area has lots of multi-cultural shops - mainly food.
And if I were to travel a little out of town, I think the same holds true as well. Country towns seem to be more likely to be white people. Yet a growing number of other cultures are starting to move in. They would prefer to stay closer to the big cities of course. Yet the government is giving incentives to move into the country. And the churches in the country towns typically have the non-whites attend church - before they start their own congregations.
As I said culture play a large part. People like to sing and listen in their own native tongue. Using a second or third language can become very tiring. Also - the cultural differences and traditions can be quite upsetting on both sides. Africans have a different clock. They see time as an idol of the west. On the other hand - the Western Cultures value time. Music is a huge issue as well. Not just for different nationalities but for different generations. It can be very divisive. Not in the sense that people hate each other - but in the sense of comfortableness. My brother for instance - is unable to listen to much of the modern music - it sends his arrhythmia into overdrive.
Yet my son, prefers the modern music - and tolerates to some extent - the older hymns. I personally prefer singing Psalms.
I have not found -overt racism to be part of any congregation I have been part of. There are different traditions - which has caused some issues - but predominantly, the biggest issues which have divided the congregation and caused splits has been over personality splits. When people come in and expect every person to simply say yes - and not express an opinion. And typically the split is not earthshattering. Normally, the person has come with one or two people - and then when they find that the rest of the congregation like to think and express their opinions, the newcomer and their one or two friends leave and head of to the next church in the street.
Racism in Australian churches - at least from my anecdotal experience over several denominations and decades is almost totally non-existent. It really is not an issue.
My closest friend growing up was a young Aboriginal man. At times I saw him racially abused - but never at church. It occurred at school and by people I know were quite anti-religious. Or it occurred when we were at the local pub or some party. Yet, it is true this friend of mine would also call whiteys "white trash" sometimes as a form of endearment and at other times as a total insult.
Although clearly racism existed in the community - I do not recall it every being a problem in the church. Yet, I would not say it did not occur. I just never saw it - and if I believe as I do that the church reflects to some extent more or less the local community - I expect there would have been some. However, my church as most other churches are not intrinsically racist. I think racist churches are anomalies, not the norm. The Gospel is for all nations. Not just one and in Christ - the church teaches all are one.