Strickalator,
I am also an intersex Christian. I am a Baptist who has a mosaic genotype, meaning my genotype is xx/xy. I am neither male nor female genetically. I am intersex, and I am as God created me. You are intersex, and you are as God created you. Like you, my parents had to choose a gender for legal purposes. If you have partial AIS, you probably didn't look typically male or female at birth, and you shouldn't have. I'm sorry for any surgeries or "corrections" your parents chose for you.
There is a tremendous amount of misunderstanding that has been thrown your way, and I wanted to lend my voice to you, letting you know that YOU ARE NOT ALONE! God loves you, He made a plan for you, and He knows your heart. In many ways, we have the loneliest walk of all on Earth. At this point in history, we are reviled by our fellow Christians because we muddy the waters on gender. We're not male and we're not female. Sorry, to everyone who is going to be riled because of that phrase, but we're not. We're born between, and God did indeed create us that way.
In the Bible, there is talk of three kinds of eunuch. There is the naturally born eunuch, which no one wants to talk about, but this is the intersex individual! If you look at the words used, other ancient texts from the time which use the same words to describe those who are both male and female, this is what you find. Then there is the man-made eunuch. This is an xy male who has been castrated. The final is the one who sets his/her life aside for Christ. There is a VAST difference between those three, despite what many theologians say. There are others who are starting to see and starting to understand that the long-held dogmas are incorrect.
Strickalator, I encourage you to not look at yourself as transgender. You are simply being who God intended you to be. There is a genetic reason you have never "fit" into your legally assigned gender. It's because you are not that. I am nearly 40 years old, and I have no idea how old you are, but when I was born, my parents had 3 days to choose if they would call me a boy or girl. They chose girl, with every intention of removing anything male from my body. It was clear in early childhood that they chose the wrong gender. As a Christian family, this caused all sorts of problems.
Many thought I could never accept Christ, as I was born outside of His creation. Um... was I not human? Was I not one of those "everyone who believes" mentioned many times when sharing the Gospel? Did God create me, and others like me to be lonely here on Earth, and then to have no hope of eternity? ABSOLUTELY NOT!
I want you to look at the story of the Ethiopian Eunuch with a new eye. This eunuch had been banned from the temple, as is dictated in Leviticus 21 and Deuteronomy 23. He knew he could not go sacrifice, as he was "damaged goods". Being a eunuch, whether naturally or man-made, kept him from worshiping. This is the reason for his question "is there anything to prevent me from being baptized?" He wanted to take part in eternal salvation through Christ, and wasn't sure if he could! We know that he was able to, as the quick reply was to the effect of "well, here's some water!" This means we can belong FULLY to the Body of Christ. We're not outsiders anymore!
As to being sexually impure if you date? Well, this is between you and God. It really is. I know some fellow intersex individuals who feel the need to be single, while I know many others who live according to the gender they actually are (instead of their forced legal assignments), and are happily married with families. You know? Every one of them arrived at their decision through prayer.
Please know that I understand your pain and your journey. Don't listen to the hate coming in the form of "godly counsel". It's what it is... anger at something they don't understand and aren't taking the time to understand, or having the compassion to even think past their own ideas or what they've been taught. Read Isiah 56, especially verse 4. God promises we naturally born eunuchs something (as He does in other areas of the Bible, as well). It's comforting to know that we're loved, we're created this way, and that God has a plan. Don't let others drag you down.