The Purpose of Mosque

The Ruby Knight p.298
'I still need to spend some time in the church.'
  'Why? God is everywhere, isn't he?'
'Of course.'
  'Talk with Him here, then.'
'It wouldn't be quite the same.'
  'Whatever makes you feel right, I suppose.'

Now shall we get to the topic.
I then realized that mosque is not the place to talk to God alone. We can talk, or pray to God everywhere, not only in the mosque. But why every sane scholar encourage us to go to mosque? It means that mosque has bigger purpose than just to pray to God. A lot bigger, and central to almost everything. Wish I remember the part in Fadhail Amal regarding the solat with jamat in masjid.