It could be that Hillsong doesn’t follow a formal membership. If you attend there and consider that your church then you’re a member. Hillsong is falling into the trap of mistaking a gay lifestyle for one who struggles with same sex attraction. People who live a gay lifestyle will, at some point, not be comfortable in a church that teaches the Bible. People who know the gay lifestyle is sin, don’t practice it, and are honest about their struggle with same sex attraction should be welcome in the church as a fellow struggler with sin. It would be refreshing to hear Hillsong, or any church say something like this: “If you are a practicing homosexual then you should find another church to attend because we will not support your lifestyle. If you are an individual that struggles with same sex attraction then please come and find help here. You are not alone, we all struggle with sin.”
And your earlier comment about Campolo was right on.
“It could be that Hillsong doesn’t follow a formal membership”
All it takes is a quick google.
http://hillsong.org/resources/become-a-member