Likewise with Deepavali here. Almost all Christian children join in bursting firecrackers for Deepavali and the money spent on crackers is probably more than on clothes plus cakes for Christmas.These days people see Christmas as a holiday/celebration than a religious thing. Atleast with the people I know of.
It is natural that Hindus in USA enjoy Christmas as a festival.
USA and Britain (from the 16th century or so) have a Puritan/ Protestant foundation and protestants do not recognize Catholic Saints. Yet Santa Claus (Saint Nicholas) is needed as otherwise Christmas would only be a solemn affair (midnight mass and possibly other religious gatherings and singing of hymns) if there were no Christmas Tree or Santa Claus to tie gifts for children!