Religious debate

In December, a local Protestant church posted advertisements about an upcoming event -- "Is Jesus Really the Savior of the World?”  (BTW, the ads promised a free dinner as well).  Don't they have a stake in the answer being yes?  I mean, if the answer is no...or the congregation is ambivalent about their purpose...is there any reason for the church in the first place?  Seems like a better and more controversial topic would be "Is Jesus the Only Savior of the World"?  Such a topic could possibly, if managed properly, provoke a debate concerning world religions...maybe open some eyes, dispel some myths, expose discrimination, etc., and that would be a good thing.  Just saying.