Christians are warned not to forsake the assembly of themselves in Hebrew 10 verse 25.

The truth is that christianity is not place specific as God can be worshipped anywhere. Afterall, He's the omnipresent God and lives everywhere at the same time. So, even if one is in a room, God still hears and responds to his prayers.

Despite that, God wants believers to be at constant touch with one the other and to fellowship. One sharpens the other. In the area where one lacks strength, the other is able to encourage him.

Also, when believers come together there's a corporate anointing that is released in to the atmosphere. Their faiths acting together produces mighty results.

Also, when a believer sees the faith of another, the progress of another, he's encouraged to press in for more.

Lastly, christianity isn't for sitting at home bit rather than for proactiveness. There's a limit to what one person can achieve serving God alone but Together, Everyone Achieves More