There doesn't seem to be a WikiTree profile for this man yet, so I wasn't able to check the life details and sources.
The "fact" that you quote looks like it comes from an online family tree somewhere, so the authority for this information is an unidentified person who posted something on the Internet. Reliance on that kind of "source" leads many of us badly astray. It looks to me like the "source" may have combined data from unrelated records. It's not clear where the baptism date might have come from. In any event, a child who was born in Pennsylvania would not have needed to be naturalized, and if they were naturalized, it would not have been at age 12. Probably the naturalization record is for a completely different person.
The naturalization reference is a citation to a book that's available for free on the Internet. At various times in American colonial history, adult male citizens of countries other than Great Britain were required to be naturalized -- or take oaths of allegiance to the king or crown. The book cited contains lists of people recorded as being naturalized. As your source indicates, the naturalization of John Riegell (note spelling) is on page 115.