Many Christians are circumcised, but not for religious reasons. Circumcision plays no role in Christian morals or theology. Circumcision soon after birth is a Jewish and American practice. Islamic and Filipino circumcisions are generally performed on boys aged 4-10. The rite of passage circumcisions common in Africa and Polynesia are often performed on adolescents. In Europe circumcision is confined to Muslims and devout Jews.
American routine infant circumcision is not carried out in ways that minimise suffering. The AAP urges that lidocaine be used, but most doctors ignore that recommendation. There are no studies of the possible correlation between circ status and sexual function, based on large representative North American random samples. The biomedical instrumentation needed to quantify sexual sensations does not yet exist. Hence the possible adverse effects of infant circumcision on adult sexual pleasure and function are unknown. Hence we do not know if infant circumcision is "safe" or not, and the practice should cease forthwith.
Circumcision removes parts of the male body that are very sensitive and very sexual. Foreskin motion facilitates masturbation, foreplay and penetrative sex. The foreskin is much more than a mere sheath for the glans.
Many North American women who have been in relationships with both kinds of men have revealed in social media that they prefer intact partners. American medical and sexual research has yet to do a single study, based on a large random sample, of this anecdotal claim.