No it is not considered more healthy, and that may be the general consensus among religious nuts and other men who were multilated and have trouble dealing with that reality, but it is not based in fact when assessing the topic on a global scale.

If you want to talk about healthy I hear that if you remove the penis entirely you can no longer get an STD. Maybe we should start doing that, since obviously it’s more healthy.

An umbilical cord falls off naturally, it is not meant to stay with your body forever. Your foreskin however is the most sensitive part of your penis and is a permanent part of your body, so your comparison against an umbilical cord is unintelligent.