Before dating someone who claims to be a Christian, you need to know how they respond to all of the following questions.
1. Is Jesus the uncreated God? 2. Are Jesus, God the Father, and the Holy Spirit three coeternal persons? 3. Is Jesus fully divine and fully human? 4. Are all people born in a state of sin, inherited from Adam and Eve due to their transgression? 5. Are believers justified through faith, by the free grace of God? 6. Is the institution of marriage a lifelong covenant between one man and one woman, dissoluble only through death, abandonment, or adultery? 7. Is sexual intercourse a practice strictly for married couples?
All of these questions are either first-order matters of doctrine or would indicate how a dating relationship in particular would end up. In addition, there are questions I would ask about second- and third-order matters (limited atonement, spiritual gifts, infant baptism, etc). What additional questions you would ask would depend on your Biblical hermeneutic and how closely you would want a partner to agree, but I have made the mistake of not gauging previous partners’ doctrine.
