LGBTQ+ Christians: What is the best biblical response to “It’s Adam and Eve, not Adam and Steve”?

A Christian should not use the “Adam and Steve” oversimplified argument, but it is based in truth that there is no continuation of life without male and female and God first institution was marriage between one man and one woman.

Nothing if you aren't being given inspiration. And I think nothing is a good response, because what you are defending is the Gospel, not LGBTQ. That is something I had to learn, and I learned it here. They aren't attacking LGBTQ's, they are attacking the Gospel. They are using their traditional legalistic corruption of the Gospel on people, which fails to understand that after Adam fell, something went wrong. Legalistic Christians act like thy think they are more deserving of salvation, and no one deserves salvation from God, it's an imputation. So if you aren't inspired, don't say anything. Learn the Gospel better than they can, first. 

God created both Adam and Steve. Some people can't tell the difference between Adam and Steve, but there is a difference and the difference makes a relationship viable. Each can find superiorities in and benefit from the other as a helpmeet.

Maybe ask yourself why you're clinging so hard to an ideology/religion group that Obvious hates you first.

You're better off without christianity. It's all nonsense anyway, but you can research that for yourself.

No such thing as LGBTQ+ Christians

Steve died of AIDS.