Judging Atheists????

I have friends that are atheist. In fact one of my friends who is atheist acts more Christian like than some Christian I know. I never tell anyone they are going to hell because I don't know if they are. Only God knows that. My friend said this to me once so I will pass it on," Some people are going to be suprised at the people getting into Heaven, and those same people are going to be very suprised at the ones NOT going."