Justin Bieber is a believer, hypeman and dance instructor all rolled into one for a group of worshipers in Sydney.

The Biebs is Down Under and got the huge crowd dabbing Friday to some Bruno Mars at the 4 day long Hillsong Conference. Justin's got strong ties to the church -- he does a lot of work with one of its pastors, Carl Lentz.

JB posted video from the event with the caption "SO LIT."  

No question here ... the spirit is moving Justin.