Can you provide any examples of how some religions combine their religious practices?

Answer 1

Christianity, of course, borrowed from previous Jewish customs.

Many of our Christmas customs originated in pagan religious customs. Examples: mistletoe, Christmas trees, and even the date of December 25.

Until relatively recently, Catholic masses were always said in Latin. Now, many masses are said in the language of the congregation.

http://www.interfaithcalendar.org/combinations.htm