Tattooing has been around for centuries and this practice has enjoyed a popular resurgence; especially among young people in recent years. Some get tattoos to show independence and rejection of parental values. Others get them because they believe they are stylish-a body of adornment and beautification. So the reasons vary from one person to another. God did not want his people getting involved in these pagan rituals because these practices lead people away from him. Apparently these people cut themselves and disfigured their bodies as a way of appeasing the anger of their gods.
“I beseech you therefore brethren by the mercies of God that ye present your bodies a living sacrifice holy acceptable unto God which is your reasonable service.” (Romans 12:1)
We all belong to God so we ought to act like it. If you want to cut yourself and pierce yourself Jesus dislikes this.