They are and they aren't depending on the specific religious group and the culture in which it operates.
The biggest example of this is Islam. Islam as it's practiced in the US is very different for most from how it's practiced in the Middle East, for example. One big example is dress code. In some countries, the dress code for women is a matter of law and violators are punished. In the US, it's a matter, as the religion specifies, of the individuals to choose - modesty being the governing principle.
Philip Kapleau, a Zen teacher, modified traditional Buddhist practice where monks begged as not being appropriate in the West. When I visited his center decades ago, they picked up trash to serve the same root purpose as begging serves in the East.
There are no doubt a lot of examples where the religious groups strive to keep the cultural aspects as well as the religiously mandated ones..
Why is belief non belief agnosticism so different yet singular?Why do Hindus, Jains and Sikhs have a similar culture despite being different religions?
Why is the culture of Islam so different to Christianity and Judaism despite them all being Abrahamic? Even within Islam the Arab, Persian and South Asians are so different culturally- I hardly see Arab Muslims with long beards and I hardly see Persian Muslims with chin curtains. Wedding example:
In Christianity the Coptics and Orthodox are quite different to Catholics and Protestants. I don't see much difference between Catholics and Protestants culturally- especially in America.
Jews have a very similar culture to Christians.
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Buddhism in Thailand, Laos and Cambodia is different to Buddhism in Nepal and Burma which in turn is different to Japanese Buddhism. What gives?
My experiemce that yeah cultures are different but underneath more similar than different. I can read say Rumi or thomas merton or the Tao, or read Buddha and i can go oh wow they are so different Are they? In fact i have demonstrated they are not different at all directly.
I will leave it there so to speak. We see what we see.