The Church - why?

While I've been away at Balnarring on holiday, I've been able to again ponder the question - "What is the Church for?"
Why does God call a Church into being? This is something we have to continually come to grips with. Yes, a Church is there to support one another pastorally through the trials and joys of life, which also includes providing an environment for helpful worship and relevant teaching. Yet, a Church essentially exists to corporately follow Jesus in mission to those who need to know the love of God. Have a look at Acts chapters 1 & 2. The only thing that has changed is the time and place – the purpose remains the same. May the Holy Spirit give us understanding and guidance in walking through the doors of opportunity!