Obama supporter & friend to Richard Dawkins plus the late Christopher Hitchens, Krauss is an atheist, or "philosophical naturalist" in scientific terms.
When people like Krauss tell us there is no God, that's their religious belief, not science.
I also note that Krauss is a string-theory skeptic, meaning he admits there's no physical evidence to support such ideas.
The materialist theories that people like Krauss support are just as fraught with difficulties as the theistic theories.
Yes, Krauss has created a sort of religion because he has faith without proof that the universe consists only of matter and energy.
This notion that people have that science and religion can somehow be separated into their respective areas of expertise is bogus. Scientific atheists certainly don't buy it. They are trying to develop a Theory of Everything, not a Theory of Everything Material. And religious folks realize that the pursuit of science depends entirely on ethical decisions that can only be justified by philosophical claims that tend to lead toward a belief in the supernatural.