I will vote too if "agnostic" is added to the list. Believing there is no supreme being is not the same as not being sure there isn't one.
I have used Linux for almost 10 yrs but I have been an agnostic much longer than that, so Linux didn't do it to me.

I just noticed there is an option that says "I use Linux and I am not an atheist". Strictly speaking, that applies to me.