The easy answer is that it is diversity which propels us forward.
Forward...toward people fleeing Christianity in droves? How bizarre....
You both speak about the inability to communicate with each other until the gigantic sky-scrapers of empty phrases will break down to a nothing. First of all: There's only one truth. We could not even do science, if there would be many truths or the "truth" (=pseudo-truth) to say there's no truth at all. Second: Everything what we see fits to this one and only truth - but is not this truth on its own. Diversity is only a result of the flow of time ("forward"). This diversity is possible because of the energy of the sun which causes the local paradox that our growing of diversity of life on Earth is a process which is similar to a film, which produces out of a shard of glasses a crystal chandelier. Somehow we don't know whether we are only remembered parts of a lost world (=an echo or a dream of the paradise) or whether we are really on the way "forward" to heaven. But whether we like it or not - whether we deny it or not - whether we think about or not: Everyone lives in "fear" (=anxiety) of hell, while it's better to live in "fear" (=respect) of god.
Anxiety and lived nightmares - a hell of alcohol or drugs for example - destroy us. The love of god, the god of love, brings all people together and let us find ways of health.