How can we be saved if Christ wasn’t God?

He will judge also the Ebionites; [for] how can they be saved unless it was God who wrought out their salvation upon earth? Or how shall man pass into God, unless God has [first] passed into man? And how shall he (man) escape from the generation subject to death, if not by means of a new generation, given in a wonderful and unexpected manner (but as a sign of salvation) by God—[I mean] that regeneration which flows from the virgin through faith?

Or how shall they receive adoption from God if they remain in this [kind of] generation, which is naturally possessed by man in this world? And how could He (Christ) have been greater than Solomon, or greater than Jonah, or have been the Lord of David, who was of the same substance as they were?

Irenaeus of Lyons
Against Heresies, Book IV
Chapter XXXIII

 

God the Son became man to conquer the enemy

As I have pointed out in the preceding book, the apostle did, in the first place, instruct the Gentiles to depart from the superstition of idols, and to worship one God, the Creator of heaven and earth, and the Framer of the whole creation; and that His Son was His Word, by whom He founded all things; and that He, in the last times, was made a man among men; that He reformed the human race, but destroyed and conquered the enemy of man, and gave to His handiwork victory against the adversary.

Irenaeus of Lyons
Against Heresies, Book IV
Chapter XXI

Bodiless souls exists after death before the resurrection

By these things, then, it is plainly declared that souls continue to exist that they do not pass from body to body, that they possess the form of a man, so that they may be recognized, and retain the memory of things in this world; moreover, that the gift of prophecy was possessed by Abraham, and that each class [of souls] receives a habitation such as it has deserved, even before the judgment.

Irenaeus of Lyons
Against Heresies, Book II
Chapter XXXIV

Eucharist—the medicine of immortality

Especially will I do this if the Lord make known to me that you come together man by man in common through grace, individually, in one faith, and in Jesus Christ, who was of the seed of David according ot the flesh, being both the Son of man and the Son of God, so that you obey the bishop and the presbytery with an undivided mind, breaking on and the same bread, which is the medicine of immortality, and the antidote to prevent us from dying, but which causes that we should live forever in Jesus Christ.

Ignatius of Antioch
Epistle to the Ephesians
Chapter XX

God manifested in human form

Hence every kind of magic was destroyed, and every bond of wickedness disappeared; ignorance was removed, and the old kingdom abolished, God Himself being manifested in human form for the renewal of eternal life. And now that took a beginning which had been prepared by God. Henceforth all things were in a state of tumult, because He mediated the abolition of death.

Ignatius of Antioch
Epistle to the Ephesians
Chapter XIX