Clearly, materialism's error has lain not in the laudable effort to improve the conditions of life, but in the narrowness of mind and unjustified self-confidence that have defined its mission.
Well, as I said earlier, I'm not sure "materialism" has a mission, except if you're talking about Marxism. But since the previous paragraph was complaining about consumerism, I assume they're talking about the West.
The importance both of material prosperity and of the scientific and technological advances necessary to its achievement is a theme that runs through the writings of the Bahá'í Faith. As was inevitable from the outset, however, arbitrary efforts to disengage such physical and material well-being from humanity's spiritual and moral development have ended by forfeiting the allegiance of the very populations whose interests a materialistic culture purports to serve.
I'm trying to make sense of this. Are they complaining that religion has not been injected into scientific endeavors? One reason for that is that religion very often has fought against, and sought to place limits on scientific experimentation that would destroy its very foundation. The relationship between scientists and religionists has not, historically, been very friendly. The last thing any scientist is going to want is interference by any religion, telling them that they can't investigate in certain areas, or that their conclusions must be rejected on the basis of religious dogma. I'd like to know exactly how the UHJ thinks the two should be blended. Would they like scientists to talk about God or scold us about risky behaviors while they try to cure disease? Would they prefer certain avenues of research to be prohibited on a religious basis?