I heard about this Heaven's Rehearsal event and couldn't believe it. I've heard of some pretty arrogant Christian ideas but this just takes the cake. Although the idea of worshipping with a massive number of people has a great appeal to me. There are some real issues that need to be addressed with the way this event is being billed.
First it is based on a flawed eschatology. This escapist notion misses completely that the Kingdom of God is Heaven. Heaven is not some far off spatial reality to which we are all Hoovered away. Heaven is the presence of the fullness of the Kingdom of God. So instead of playing out some otherworldly drama in a fit of narcissism, worship is meant to orient us towards the world that God so loved. It turns our heart to God to get ahold of what God loves. God came here and sent us here. Why do we somehow think our lot is to simply hold the fort until we go off to some literalized hyper-Eden. Meanwhile, leaving the real object of God's love to suffer the grossness of our sin. It doesn't add up.
They opening page says that the purpose is to pollinate the Kingdom. What it pollinates is this narcissistic notion that God loves those who bury themselves in the ground until God's return. Have we even listened to Jesus at all? If you really want to see the Kingdom of God, get your arse out of the Church and go where God is. Visit those in prison, offer help to the poor, embrace those with aids, heal the sick, love the lost and do something worthy of the Kingdom of God.
The idea that this is a rehearsal is so deeply offensive. We are living the real deal folks. Life is not just some practice session that doesn't matter. God returns to destroy those who destroy the earth! For the love God stop living in a fantasy world and realize that what God created is very good, and God longs to restore that goodness. You want to practice for heaven - then learn to love justice. Worship and justice are meant to kiss - this event sounds like worship is kissing off justice.
I hope they have a good time at this one. In fact I hope God shows up and blows the whole thing onto the street where it might actually do some good. Me, I'm going to invest my talent in the world and see what returns I might get. I know my God is a tough task master who will not look favourably on those who simply buried their talents in fear. I urge you to do the same.