I don’t claim to be a religious expert.
Every islamic wedding that I have went to had a religious part and a cultural (rasm) part for Muslim, Jewish, Hindu and Christian weddings.
I agree with you it is confusing because some people don’t know which one is which.
Contemporary Hindus don’t even do 90% of the traditions that are done in India because it’s just sooo time consuming.
My point is the if** you do the islamic part** and tack on the rasm part from any culture - it’s okay
I am all for a wedding day that brings JOY to the bride and groom and their families.
For couples who have spouses from other cultures - some rasms, traditions are usually depicted or taken from both sides of the family.