I'm still not exactly sure why I was circumcised, because like you, I thought only Jews and Muslims practiced it. Yes, my family is Lutheran Christian. At one point (early 20th century) 95% of baby boys in the USA were circumcised. It actually dropped down to 60% since then.
Yeah, that refers to skin cells on the glans being unkeratinized, leading researchers or whomever to believe that they are more vulnerable to infection (which is not true; the glans and foreskin in the intact penis have an immunology system) I don't believe circumcision decreases one's chances of getting infected with HIV. It doesn't matter if your lopped or not, if you have sex with anyone who has HIV there is quite a possibility that you will be infected. Circumcision doesn't make the body immune or resistant to HIV, because HIV is a virus. It just means there are more dead skin cells on the surface of the skin, which doesn't matter because the meatus (entrance to urethra) penetrates the vagina as well (which also is unkeratinized) If we really wanted to get rid of HIV, just test everybody, and quarantine/kill off everyone who is infected. Or, circumcise everyone. Turn everyone into eunuchs and allow the only form of reproduction to be artificial insemination. Why don't we do that instead? Because it's inhumane and all people care about is some bullshit cover-up for their religious customs or their feelings of misandry that violate another person's rights and well-being. And even if it was for healthful, medical reasons, it's unfair to me and others like me, because I take the proper precautions before having sex with someone. Why, just because I have a penis, do I have to suffer in order to reduce the general risk of STDs? I'm not some threat, I don't have HIV and I don't thank circumcision for that, I thank my wits.