Culture is a way of life of a group of people. It includes common practices of a society, its shared understandings, and it social organization.
Components of Culture:
Common Practices
-what people eat
-clothing and adornment
-tools and technology
-social customs
-work
Shared Understandings
-language
-symbols
-religious beliefs
-values
-the arts
-political beliefs
Social Organizations
-family
-class and caste structure
-relationships between individual and community
-government
-economic systems
-views of authority
Yes. According to this, Americans and Australians have a culture.
It's a few centuries old, but nevertheless, they have one.
EDIT:
To Pepper:
Number one... Race has absolutely nothing to do with your religious practices. Number two, I said beliefs... not belief. And Number three; you're arguing with a textbook so if you think religion has nothing to do with culture, you need to do some research to back up that argument.