There are a lot of things written in the Bible about things. Example was God forbidden to eat pig, they are dirty and they eat anything. Later on doctors found out that eating pig will raise your cholesterol levels and will lead to high blood pressure and heart disease. God said to circumcised the male as a covenant of men to God. Later on we found out that it is also more hygenic as dirt will stuck inside the skin and smells. Circumcised penis is almost always dry, very little or no bacteria will develop. But of course it is ones choice. Do it or don't.