Assuming we get married and have children, am I at fault if we raise the family Jewish? Her wanting to raise the kids Jewish does not affect my desire to be married to her in the slightest, so I’m just wondering what the Church’s reaction/advice would/might be.
You would be leading your children away from salvation in the Jewish Messiah, Jesus or God.
“Have you an infant child? Do not let sin get any opportunity, but let him be sanctified from his childhood; from his very tenderest age let him be consecrated by the Spirit. Fearest thou the Seal on account of the weakness of nature?” - St Gregory Nazianzen, Doctor of the Church, Oration on Holy Baptism, 40:17
“Now, seeing that they [Pelagians] admit the necessity of baptizing infants,–finding themselves unable to contravene that authority of the universal Church, which has been unquestionably handed down by the Lord and His apostles,–they cannot avoid the further concession, that infants require the same benefits of the Mediator, in order that, being washed by the sacrament and charity of the faithful, and thereby incorporated into the body of Christ, which is the Church, they may be reconciled to God, and so live in Him, and be saved, and delivered, and redeemed, and enlightened. But from what, if not from death, and the vices, and guilt, and thraldom, and darkness of sin? And, inasmuch as they do not commit any sin in the tender age of infancy by their actual transgression, original sin only is left.” - St Augustine of Hippo, Doctor of the Church, On forgiveness of sin and baptism, 39