. >> when we look at all the generations, sienl generatio sin of baby boomers, the younger generationticularly men millennials, are silent generation. >> reporter: 64% of generation d, 65 to 80, agree, whereas only 50% of younger millennials, say they are absolutely certain. atheists agnostics or those who even believe in god who say they are unaffiliated. >> the religiously unaffiliated, we often refer to them as nones that is n. n-o-n-e-s. they are atheist, agnostic or anything in particular. this group has grown quite a bit in the u.s. >> the change shows up in politics as well. 19% back in 2007. whereas down only a modest 5%. >> the take away, is that while the religious landscape studies suggest that there is some decline in religiousity, among those who are affiliated with religion, religiousity has remained very stable over this time period. so the u.s. remains a nation of believers, a nation that's very religious comparatively speaking. >> losing my religion this time on the program. joining me is greg smith, associate director of research at the pew research center with in it