THE VISIBLE CHURCH is all the people who get together from time to time in God's name. Anybody can find out who they are by going to church to look.
The invisible church is all the people God uses for his hands and feet in this world. Nobody can find out who they are except God.
Think of them as two circles. The optimist says they are concentric. The cynic says they don't even touch. The realist says they occasionally overlap.
In a fit of high inspiration, the author of the book of Revelation states that there is no temple in the New Jerusalem, thus squelching once and for all the tedious quip that since heaven is an endless church service, anybody with two wits to rub together would prefer hell.
The reason for there being no temple in the New Jerusalem is presumably the same as the reason for Noah's leaving the ark behind when he finally makes it to Mt. Ararat.