Think of ISIL as being a movement and beyond that an APOCALYPTIC end time movement.
That term "end time" in the Christian sense meaning an END to the world as we know it.
In all cases here thanks to the BBC:
"Why Islamic State chose town of Dabiq for propaganda"
"The small Syrian town of Dabiq, which featured in the latest beheading video from the Islamic State group (IS), has figured heavily in the group's propaganda since July when it named its new English-language magazine after the town."
"The group has focused on the dusty backwater not because of any strategic importance or the size of its population - the Syrian census of 2004 recorded that little over 3,000 people were living there - but for the power of its symbolism."
These are the true believers. They not only believe the world as we know it is going to end, they want the world as we know it to end. An apocalyptic vision of the "final days" and all that means!
"Dabiq, which lies around 10km (six miles) from the Turkish border, features in Islamic apocalyptic prophecies as the site of an end-of-times showdown between Muslims and their enemies."
"The Prophet Muhammad is believed to have said that 'the last hour will not come' until Muslims vanquish the Romans at 'Dabiq or Al-A'maq' - both in the Syria-Turkey border region - on their way to conquer Constantinople (modern-day Istanbul)."
"IS has been seeking to bring on that battle by goading the international coalition to confront it there."
NOT ONLY inciting a confrontation but HOPING AND PRAYING for the confrontation and end times to occur. Symbolism very important to ISIL, the Salafists in the manner of those first three generations of Muslims hoping to inspire the umma [world wide Islamic community] as has not been the case in fourteen hundred years!!