I am not aware of any scientific consensus stating homosexuals are born homosexual, which could be critical for the church's official position as it has left the question of cause open and to be determined by science.
Are you aware that first form is female? And if chemicals don't kick in at the right time to make them male form, we end up with babies all over the spectrum, - dependent on which stage they did, or did not, kick in? Thus if these do not kick in at all - the child will always be female.
"p. 988 "Human chorionic gonadotropin also exerts an interstitial
cell-stimulating effect on the testes, thus resulting in the production of
testosterone in male fetuses.
This small secretion of testosterone during
gestation is the factor that causes the fetus to grow male sex organs."
"NOTE:
basic internal sex is female; male development depends on hormone
> production (testosterone, DHT, and MDI" (Textbook of Medical Physiology,
by Guyton, 1986, ISBN 0-7216-1260-1, p. 956
*
"The default gender in the womb is female, which is perhaps hardly surprising given that the womb is an environment awash with female hormones.
A genetically male fetus will therefore develop the female form of sexual organs until ‘maleness’ is switched on by the SRY gene on the Y chromosome, and the fetal testis starts to develop and then produce testosterone. Incidentally a functioning ovary is not needed to appear to be female, whereas a functioning testis is essential for a man."
"You can look at gender in several different ways. Being XX or XY makes you female or male, of course, but there’s actually more to it than that.
For instance, you could be genetically female, genitally female (i.e. you have a normal vagina), but if the hormones produced by your sex organs (gonads) have been more male than usual, these would influence your brain type and thus your sex-typical behavior.
Hormones Factors in Fetus Gender and Child Future Development | Health Doctrine
That part I highlighted and underlined in blue - is where the chemicals may or may not kick in correctly - causing a full spectrum of homosexuality and transgender people.
"Many people
believe that sexual orientation (homosexuality
vs. heterosexuality) is determined by education and social constraints. There are,
however, a large number of studies indicating that prenatal factors have an important influence on this critical feature of human sexuality. Sexual orientation is a sexually differentiated trait (over 90% of men are attracted to women and vice versa). In animals and men, many
sexually differentiated characteristics are organized during early life by sex steroids, and one can wonder whether the same mechanism also affects human sexual orientation.
Two types of evidence support this notion.
First, multiple sexually differentiated behavioral, physiological, or even morphological traits are significantly different in homosexual and heterosexual populations.
Because some of these traits are known to be organized by prenatal steroids,
including testosterone,
these differences suggest that homosexual subjects were, on average, exposed to atypical endocrine conditions during development. Second, clinical conditions associated with significant endocrine changes during embryonic life often result in an increased incidence of homosexuality. It seems therefore that
the prenatal endocrine environment has a significant influence on human sexual orientation but a large fraction of the variance in this behavioral characteristic remains unexplained to date.
Genetic differences affecting behavior either in a direct manner
or by changing embryonic hormone secretion or action may also be involved. How these biological prenatal factors interact with postnatal social factors to determine life-long sexual orientation remains to be determined."
Minireview: Hormones and Human Sexual Orientation