"The statement that there is zero evidence for a higher power isn't a belief, like a religion. It's a scientific fact." People don't like to hear things they don't agree with. Secondly, global warming is a very complex subject that is normally denied not with "the earth is no longer heating up" but instead doubt of the motives of those who want to put regulations on companies, and the question of if global warming will actually cause damage. The earth is a complex system, and on those subjects, science isn't quite yet sure. I say better safe than sorry, others say better to have no regulations.
Not to say that I don't think global warming is real, or that carbon emissions should be regulated, but there are decent arguments out there. Secondly, global warming is a very complex subject that is normally denied not with "the earth is no longer heating up".