The most clear way would be - "Sam, I don't think stealing things from a shop is ok, it's illegal and you're stealing away the hard work of some people without paying for it".
That should send Sam a clear message that will explain him why stealing is wrong and why he shouldn't be tealing in the first place.
One of the effectiveness is Faith based organization usually has a stronger core that unites all members of the organization because most faith requires belief without a specific proof.
The ineffectiveness on the other hand, faith based organization members could be easily manipulated to do abnormal behavior by their leaders (such as exchanging sexual favors in the name of faith, etc)
Answer: you are the imposter
Explanation: yes you get him out of here