Hillsong is both a sort of denomination/movement and a musical group, producing some popular praise choruses (Mighty to Save, Shout to the Lord),
The belief system of the church/group is of the "name it and claim it" type, not just charismatic.
Lately, it seems like the church/group is no longer willing to condemn the gay lifestyle, which is troubling to those of use who hold a Biblical position.
Here is a mild article from the conservative "God Questions" site: https://www.gotquestions.org/Hillsong-Church.html
So how does this relate to Biblical separation.
Consider the following:
1. Many of the songs in our hymnal were written by folks we would never allow in our pulpits. Some were authored by liberals (O Holy Night, I Heard the Bells on Chrsitmas Day) others by Roman Catholics, high church Anglicans, or sinless-perfecitonism Methodists.
2. Where is the line between heresy (in contrast to mere false doctrine) and error?
Also, feel free to comment upon how dangerous Hillsong is or how much of a bogey-man some make of Hillsong.
3. Does their extreme popularity color the issue at all, or does it not matter?