You're kidding, right? They ALREADY DO side with Islamists! Why do you think they so desperately want the US out of Iraq? Can you name ONE secularist that's supportive of the war?
In the West, not overtly, militarily or formally. They do it in a Back-Handed, Can't-We-All-Get-Along, It's-Just-Their-Beliefs, Stop-Telling-Them-What-To-Do, sort of way ... We see directly through this and are able to separate words from deeds and determine intent from actions. Yes, they all side with the Islamists but few admit it or for that matter pro-actively engage in combat. The butchery has not engulfed the world by matter of state, However, Satan is on the move ...