Jesus set up his church when he was on earth. Where is it today? What does it consist of?
All true Christians, those who are presently alive here on Earth, and those who came before us, those who have already died and now live in God's presence, in Heaven are members of the
Church Triumphant (take note below that "you have come" is in the perfect tense).
Hebrews 12
22 You have come to Mount Zion and to the city of the living God, the heavenly Jerusalem, and to myriads of angels,
23 to the general assembly and church of the firstborn who are enrolled in heaven, and to God, the Judge of all, and to the spirits of the righteous made perfect,
24 and to Jesus, the mediator of a new covenant, and to the sprinkled blood, which speaks better than the blood of Abel.
The church that exists here on Earth, the
Church Militant, is made up of the body of believers who are alive today, living on earth, as well as
(I believe) a significant number of the unregenerate, reprobate men and women who are planted in the visible church by Satan. The Lord refers to His saints in the visible church as "
wheat", and to the
sons of the devil who are also part of the visible church as "
tares" ..
Matthew 13:24-30, 36-43.
The Reformers referred to both a visible and and an invisible church here on Earth. All who are part of the "invisible" church are also members of the "visible" church, but only
the sons of the Kingdom are part of the "invisible" church,
the sons of the evil one are not ..
Matthew 13:37-38.
Also, the visible church is called "visible" because we can see it, because we know who is in it. The invisible church, on the other hand, in only invisible to us, not to God, who sees and knows what we cannot, the true condition of the hearts of men, and therefore who is (and who is not) a true member of His church.
~Deut
p.s. - though filled with both wheat AND tares, the Reformers nevertheless held a very high view of the visible church, as this excerpt from John Calvin's
Institutes of the Christian Religion demonstrates for us.
4. As it is now our purpose to discourse of the visible Church, let us learn, from her single title of Mother, how useful, nay, how necessary the knowledge of her is, since there is no other means of entering into life unless she conceive us in the womb and give us birth, unless she nourish us at her breasts, and, in short, keep us under her charge and government, until, divested of mortal flesh, we become like the angels (Mt. 22:30). For our weakness does not permit us to leave the school until we have spent our whole lives as scholars. Moreover, beyond the pale of the Church no forgiveness of sins, no salvation, can be hoped for, as Isaiah and Joel testify (Isa. 37:32; Joel 2:32).
~Institutes, Book 4, Chapter 1, Part 4 (excerpt)