To the same effect Turrettin denies that the modern Church of Rome can, without qualification, be called a true Church of Christ; but to explain his position he says: "The Church of Rome may be viewed under a two-fold aspect, as Christian in reference to the profession of Christianity, and of the evangelical truths which it retains; and as it is papal, in reference to its subjection to the Pope, and to its corruptions, as well in manners as in doctrine, which it has mixed up with those truths and built upon them, contrary to the word of God. In the former aspect, we do not deny that there is some truth in that Church; but in the latter, under which she is contemplated when we deny her to be a true Church, we deny that she is Christian and apostolical, but affirm her to be antichristian and apostate. In this view, impropriè et secundum quid, we admit the Church of Rome to be a Christian Church in three respects. 1. In respect to the people of God, the elect, still remaining in it, who are commanded to come out. 2. In respect to the external form, in which we discover some of the elements of a Church, in respect as well to the word of God and its preaching, which though corrupted, still remain, and as to the administration of the sacraments, especially baptism, which, as to the substance, still remains entire. 3. As to Christian and evangelical doctrines, as concerning the Trinity, Christ as mediator, his incarnation, death and resurrection, and others by which she is distinguished from pagans and infidels." vol. iii. p. 135.
(source - C. Hodge, The Church and Its Polity - p. 211)