We support them in their shared identification of a great threat, in this case, imperialist activity.
> In fact ought we relate to the religious who share
many of the same enemies as we do, but who might
dream of a religiously based utopia, unlike ourselves?
We can relate to them, but also point out that while we are opposed to the same danger, we are also opposed to their alternative (as they are free to do with regard to our version of utopia).
This way there are fewer suprises down the road. You are honest and transparent up front by identifying areas of agreement as well as areas of contestation.
Brian