I agree with you. An ELCA member who supports ordaining gays and gay weddings told me, “Churches should change, to conform to society.” I said, “No, society should change, to obey the Bible.” She didn’t have a response to my comment. We argued for about a half-hour, and neither of us changed our mind.
Yes, Church’s are not meant to be a reflection of society, and any church that ever is, is a blasphemous one.
I’ve long used the phrase “Christ established his Church to change people’s minds; not change itself to suit people’s minds.” As with you, that usually don’t have much of a response.
12:1 I appeal to you therefore, brothers, by the mercies of God, to present your bodies as a living sacrifice, holy and acceptable to God, which is your spiritual worship. 2 Do not be conformed to this world, but be transformed by the renewal of your mind, that by testing you may discern what is the will of God, what is good and acceptable and perfect.