I think we all (not just the non-believers) want an inclusive, rational world. This requires making changes throughout our lives and change is something humans tend to resist. This matter is especially important in a world changing increasingly rapidly. Change is best embraced and managed, not imposed or resisted.
Progress requires change and change must be managed intelligently. It is intelligent to simplify the complicated (as thinkers and scientists do), not to complicate the simple (as religionists do with their creeds and theologies).
This reminds me of the move to the metric system. Businesses work on the metric system, (including US businesses*)
*The U.S. has already adopted the metric system, it's just not the only system of measurement used. The U.S. uses both metric and U.S. standard units. The U.S. government and many industries have already converted to metric. ... Federal government contractors must use metric measurements for most things.