What a religious organisation teaches is flexible really as most have many local assemblies with different leaders, and it's difficult for them to think similarly. And it's no surprise that some younger leaders are more liberal (read non-Biblical) in their "theology". So where does that leave us?
Hillsong's "
what we believe" makes no reference to the
"perseverance of the saints1" (btw Farm Truck, Calvin would have no idea what you're talking about if you said that to him), and they say they are "closely associated with the Australian Christian Churches
" whose Doctrinal Basis makes no reference to it either. (as an aside, Hillsong is considered a separate denomination from ACC under
Australian marriage law)
If we look at Revelation 2 & 3 we see that after 50-60 years churches can become apostate. Certainly Laodicea was, with Sardis not being much better. In fact I know a church that was closely associated with Hillsong though is now simply ACC, that is a Sardis church, having a reputation of being alive but is dead. They're probably approaching apostasy, having not preached the Gospel of salvation for over three years, having not even said the word sin for over nine months, having gone over six months without having communion, having had at least two speakers who support same sex marriage and one (twice) who (on the basis of probability) seems to have had a very cavalier attitude to the death of his children
2.
If we are students of the Bible we should not be surprised to see churches start off good then become bad. Israel did it all the time. Paul's letters often addressed problems in the different churches. Most of Judah's and Israel's kings were evil (see
https://s3.amazonaws.com/bg3-blog/bl...ated2020-1.jpg).
...FFO
1) Here's some scriptures purported to support the idea of the
perseverance of the saints.
2) The speaker spent most of his time telling us how he and his wife just had a child via IVF.