The Pew Research Center has issued a report on “Religion Among the Millennials” – those born after 1980 and coming of age around the year 2000. Here is the synopsis from a post announcing the report:
By some key measures, Americans ages 18 to 29 are considerably less religious than older Americans. Fewer young adults belong to any particular faith than older people do today. They also are less likely to be affiliated than their parents’ and grandparents’ generations were when they were young. Fully one-in-four members of the Millennial generation — so called because they were born after 1980 and began to come of age around the year 2000 — are unaffiliated with any particular faith.
You may read the full report here. The following are links to report sections and the full document in PDF form.
This is just a portion of their research on Millenials.