Why do some Christians use the word evolutionism" instead of evolution, and why do some use "the little boom" instead of the big bang?

Because they have been indoctrinated by the extremist sects and cults to believe that God was not clever enough to use the big bang, evolution and science as his tools!

Some Christians, more specifically creationists, use the word evolutionism" instead of evolution, and some use "the little boom" instead of the big bang because they will do whatever they can to demean those findings of science that show that their beliefs are nothing but superstitious and myth-based nonsense.

Evolution and the Big Bang have all of the evidence, which is why creationist Christians are forced to do whatever they can to denigrate scientific realities.

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Was evolutionism caused by the little boom?

Christians are taught to ridicule those who aren't part of their group.

because they are morons simply

They can't seem to ask an intelligent, mature question about evolution, so they resort to absurdity.

This is the only place I've seen/heard "evolutionism" used. The "little boom"? Now you're just being silly.

Me... for the same reason I say christer and bibel-god and Jebus 😎

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"Evolutionism" conveys a belief system surrounding the theory of evolution similar to the way "creationism" is a belief system surrounding the theory that God created the universe. "Evolution" by itself doesn't convey the opposite to creationism like evolutionism does.

Those who use the term "creationism" shouldn't have any problem with "evolutionism", and if they do, they just show that they are inconsistent (which often is a requirement to make evolutionism appear to be true).