A pack of unruly teens went wild inside a New York City Scientology building Saturday ... leaving a trail of damage and even injuring an employee in the process. The terrifying incident went down at the Church's building on W 46th street -- just a few steps away from Times Square -- at around 4:24 PM, the NYPD tells TMZ. Officers responded to a call for a burglary in progress after the mob forced entry into the building through a side door, causing property damage. Police say the caller -- a 30-