And again you may be begging the question about what “getting in bed” is.
Sometimes the phobia that one might, somehow, sin can become so paralyzing that a mighty door for a simple testimony is simply ignored. And this is a mighty illustration of it.
And perhaps you are ignoring the Biblical command for separation.
As I said, you believe and do as you will. I happen to be both a Christian and a published writer. I know writers from coast to coast from a variety of Evangelical denominations. I have discussed almost precisely this scenario with other writers who are serious about their faith. Most would never allow cults to use them to propagandize false religion.
“Sometimes the phobia that one might, somehow, sin can become so paralyzing that a mighty door for a simple testimony is simply ignored.”
There’s a powerful opportunity now for you to bear your Christian testimony to a Mormon community. Do you accept the opportunity because there is lots of possibility, or decline it because there is lots of fear?
Your choice.