If you agree with that, then I submit that the "church" is anywhere there are true Christians, regardless of affiliation.
But what if a true believer is one who accepts the authority that Jesus Christ gave to the apostles and is now exercised by their legitimate successors the Catholic bishops; one who accepts the teaching of Jesus Christ regarding the sacraments given to the apostles and preserved by the Catholic Church?
That is not supported in scripture. There are a number of passages that discuss salvation and none of them involve bishops or the catholic church...they involve faith, belief and baptism.