Bruce Jenner has made the whole "sex change" concept "socially acceptable." Of course we who are faithful to the Kingdom of God would take a different view.
People are born with either XX chromosomes or XY. That is their objective gender. Although some people may be born with both genital sets (extremely rare), the XX or XY pattern is one or the other.
There are people who feel more comfortable being a gender other than the one into which they were born. Reasons may vary, but I think most of us would insist the right thing to do is to learn to cope with and accept ones gender. We should obviously seek to discourage any such operations or changes. That is assumed, although if I have assumed correctly, you may comment to the contrary.
With Jenner's example, the culture's floodgates are now wide open. It is ironic that the people who say, "Science, science, science" are silent when it comes to the real objectivity of genetics. Chromosomes are objective.
So, how will we deal with people who have had sex operations and then get saved? Or who fell away from the Lord, had operations, and then later repented? Is a male now female because he has altered genitals and artificial breasts? How do you treat them? Which rest room should they use?
Interestingly, some schools are now adding "family" (private single) rest rooms -- I think specifically for the kids of one gender who believe they are "internally" of another. Will churches need to do the same?
A lot of this is not relevant right now. So the question assumes this problem will become more common and that some people in this category will get saved.
Being experienced with SI, I know some of you cannot lay off the phrase, "It depends." So let's assume this situation. Twyla, whose former name was Trevor, is 40 years old. This person has come forward and wants to give his/her life to Jesus and has no spouse. Now that Twyla/Trevor believes, what should this person do to follow Jesus? Should this individual be treated with the advice of Paul in other (very different) situations (I Corinthians 7:20, ESV)?
Each one should remain in the condition in which he was called.
What are your thoughts? You might share comments about different situations and scenarios (e.g., what if there was a spouse involved, or step-children).
These are things we need to think through.