There are more than 4400 distinct Christian denominations in the US. Assuming that someone else's flavor of Christianity is identical to your own is absurd. That's what we have words for. For example, the church I attended as a teen did not preach against premarital sex, was active in abortion clinic defense, and began performing same sex marriages in the 80s. I am aware there are other churches and Christians who don't believe in those things, nor do they believe in the individual consulting god and reaching a decision like, "premarital sex is ok here because it is caring and loving, and god is a loving god, and consulting god and my conscience, I made a decision." Assuming someone believes the identical things you do just because you're under the same enormous umbrella is ridiculous.