Religion doesn't really have all that much to do with it. It's affiliation, and more importantly it's politics of economy. Obviously, concern for the environment would lead to restrictions on business practices. Conservatives cringe at this, and consider it an all-out assault on capitalism. They want to defend rather pointless practices such as pouring pollution into the air. Accepting the science of global warming (and it's human causes) would contradict this preconceived bias, as they would be forced to do something about it or obviously they would be perceived as irresponsible and immoral. So what's the only alternative? Attacking the science.