I wonder what it is like to have a gender change. Some changes in some animals occur naturally. 
Wow, You mean gender change in animals can occur naturally, what animals are those?
If I recall correctly some worms do that. But most what comes to most people's minds is surgery for humans. 
Yes that is what comes to my mind.  Do you know how common is gender change in humans?
No I don't know that. But I do know it is used in procedures for intersex people. 
It seem like a lot of risk and trouble to change gender so I guess they must really want it very bad.
Intersex
Intersex people are individuals born with any of several variations in sex characteristics including chromosomes, gonads, sex hormones, or genitals that, according to the UN Office of the High Commissioner for Human Rights, "do not fit the typical definitions for male or female bodies". Such variations may involve genital ambiguity and combinations of chromosomal genotype and sexual phenotype other than XY-male and XX-female.
Intersex people were previously referred to as hermaphrodites or "congenital eunuchs". In the 19th and 20th century,
in his image, then even if he fashioned us by some evolutionary means, he would presumably want us to resemble him in being able to know; but then most of what we believe might be true even if our minds have developed from those of the lower animals."
Plantinga defined:
- "N" as naturalism, which he defined as "the idea that there is no such person as God or anything like God; we might think of it as high-octane atheism or perhaps atheism-plus