Sorry but I don't agree
The simplest definition I can provide is given by Wiki Answers:
Culture is sort of an umbrella term defined by the traditions, language, art, food, and various attributes of a particular group (be it a group of five or an entire country). Religion can be classified underneath the concept of "culture"; however, religion itself is a practice in which one seeks to commune with, and worship a power considered higher than one's Self.
So
while there is inter dependency however please don't confuse what is prevalent in a society as culture or tradition with religion. Islam as a religion is spread all over the world and some things done or not done by Muslim's originate from the culture and tradition of the country they live in.