Here's Cardinal Cormac Murphy O'Connor. When asked on his opinion on atheists he clearly says 'there is something not totally human'... 'A search for transcendent meaning - we call it god - ... if you leave that out you are not fully human.'
Now, I've said, I'm not really an atheist. I'm a radical agnostic, because I think that all our models of the Universe are necessarily wrong. I don't think we can reduce phenomena to a material substrate. However I've never heard an atheist saying that s/he believes religious people are not fully humans. That's why I tend to have more allegiance to secularism and atheism.
I have been told BTW that scientology has a similar belief system - those who have not been through their process, whatever it's called - are not real people.
* ETA - thanks to someone who commented and then deleted her comment - true, I don't think clones have souls, because I don't believe in souls. But, hopefully it's clear what I mean, everyone human is 'a real human'.