The common lectionary of 7 May, year B, includes this tidbit of history from the book of the Acts of the Apostles: “The people in the city were divided, some supported the Jews, others the apostles, but eventually with the connivance of the authorities a move was made by pagans as well as Jews to make attacks on them [the apostles] and to stone them.”  (Acts 14: 4-5, Jerusalem Bible)
It is fair to assume that those referred to here as “the Jews” and “pagans” were not natural allies. The situation is described as the city being “divided” and the event requiring “connivance.” Consider that the Romans who were not Jews, (and therefore, by default, considered “pagans”) had multiple deities all or almost all represented by some man-made imagery, usually sculpture. Compare to “the Jews” who were worshipers of one God and were forbidden graven images of Him, and there becomes evident a natural antagonism.
What brought these two groups together? The very same factor that brings Islam and the Western political left into alliance with each other today: The old adage, “The enemy of my enemy is my friend.” Until the perceived common enemy is vanquished, the alliance is viable and useful, even necessary, harmoniously focused on the common goal.
Consider further that the political left, with its dogma that any dogma is inherently oppressive, compared to the unyielding dogma of Sharia’s minutiae. Sharia declares a death sentence on homosexuals, for example, while the Western political left regards homosexuals and generally “all sexually perverted” as protected under the umbrella of victimhood according to the edicts of political correctness. This is direct opposition, akin to the proverbial “unstoppable force and immovable object.”
Another obvious example is the permission, even admonition, given husbands and fathers, via Sharia, to beat, maim or murder their wives or daughters for even minor perceived slights or gestures considered incorrect.  This,of course, cannot in any way be synchronous with the Western left’s adopted visions of feminism, women’s liberation, or even common decency. Regardless, it demonstrates the almost indescribable intensity of the left’s hatred for all things religiously and politically conservative that they ally themselves with Sharia, the Muslim Brotherhood, et al.
Such intensity of vehemence is daunting to those not of the left’s revolutionary mindset, but who, instead, seek to preserve what we know to be good and right and true. Faced with such opposition, our realistic strategy for prevalence is unification. A unified Christianity is a force that the strength of the gates of hell cannot overcome. The Roman Catholic Church is the spearhead in this conflict, presently. Let us put aside doctrinal differences and petty arguments and disagreements. Our opposition has put aside far greater differences than exist among us. All who wear the name “Christian” must rally together against the legions who seek our demise.  A unified Christianity will constitute a formidable Holy Alliance.