On your first point, that can be said of many religions. But many (most?) people realize that the holy books have been written in different times, and adopt the parts that can be integrated with modern life.

You can never be completely reassured there is no ulterior motive, whether that motive stems from religion, corporations, or something else. But I do think (and see that in national politics) that many religious people are able to separate what they think is morally good from what society thinks what is morally good. Just witnessing other cultures for some time will give rise to the realization that your truth is just one truth.

I am confident that cultures will eventually blend. It's just harder when the are further apart.