Justin Beiber's Pastor Carl Lentz Good Lord He Can Hoop!! ... Running With Jay Williams

Turns out Justin Bieber isn't the best basketball player up at the Hillsong Church ... that honor would go to temple honcho -- and Bieber's spiritual advisor -- Carl Lentz, who seriously has game. Like, for real. TMZ Sports got our hands on some video of Lentz in action ... balling along none other than ...