When I use the word ‘church,’ I use it how it was used in the Bible. In its simplest, it means those people who believe Jesus Christ was the Son of God he claimed to be, and accept His death and resurrection for all the true life He offers. (see I Corinthians 15:3-4) The most complicated the word ‘church’ gets is to describe those who gather together to encourage each other.
To read more, to go:
A Hopeful History of the Church