What is the greatest threat to Christianity... is it Islam? Postmodernism? Perhaps it's the new Harry Potter book or the Jerry Springer musical? Rock music? Gay marriage? Richard Dawkins?
I actually believe that the greatest threat to Christianity today is....
Christians who fail to recognize that 'He who is in you is greater than he who is in the world' (1 John 4:4)
Christians who fail to love their neighbours, serve the poor and reach the communities.
Christians who put their own ambitions before others.
Unfortunately, this makes me one of many great threats to Christianity.