How do I tell my parents I don't believe in God anymore?

I was raised in a pretty strict religious setting – my parents are Christian teachers, so are my grandparents, and I went to a religious elementary, middle, and high school.

Now that I’m in college, I feel more secure in my agnosticism, but I don’t know exactly how to tell my parents – I don’t want to be a pariah, but I do want to be honest about myself – would it just be easier to ‘go along’, or is there a good way to break the news?