Explain to me how you separate yourself from the world. Is it covering and/or getting rid of the tattoos? Meaning then, that the tattoos are what is worldly? Is it the face piercing, or is it the dress? What about one's appearance makes one holy (meaning separate)?
Are church leaders to dress a certain way? A socially acceptable way? Does their appearance separate them from the things of this world? Like this guy?
Brother, I understand that you would be unable to attend a church where the preacher was tattooed and/or pierced. That's fine. However, having issue with someone's appearance does not make them any more or less holy. Please try to not judge those of us who have no issue with it, or with tattoos in general.
The separation from the world is that we view everything differently than the world. We understand that we are sinful and we give all credit for our life and salvation to God. We are of renewed mind and spirit by the Holy Spirit through Christ who saves us.