Simply put:

The church is not a “why”

The church is not a “what”

The church is not a “how”

The church is not a “when”

The church is not a “where”

The church is a “who”

The “who” (Christians)

meet at different “wheres” (address, location, etc.)

at different “whens” (times, days, etc.)

with different “hows” (own space/rented space/public space, coffee/no coffee, etc.)

to do different “whats” (sing, pray, teach, etc.)

because of the “why” (God’s glory).

“Who” and “Why” are settled. The rest are flexible.