Yahweh, the god of the bible is who they believe did this.
Not Shiva.
Not some random god.
They may wave hands a bit on "Allah" but the fact is most christians beliefs are exclusive of islamic beliefs. The islamics will go to hell or purgatory. The christians will go to a lower level of heaven (at best) or hell.
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They willfully ignore mountains of hard facts which they could observe themselves directly in order to maintain this belief. Even tho the conclusion from that is that Yahweh for some unknown reason decided to create all kinds of false evidence of an older earth and to create dna patterns which are very similar to apes.
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There is a huge gap from "a god created the universe" to "the god of the bible created the universe and wants us to worship it, ordered hebrew tribes to slaughter men, women, "suckling babies", and old people, ordered them to not mix two types of cloth, and had a few dozen kids attacked by bears for mocking elijah. Killed 99% of humans at least once- perhaps twice, and then repeatedly engaged in infanticide and genocide.
Sure-- an unknown god may have created the universe-- but that doesn't mean it is yahweh.
Most Theists disbelieve every god but one. Atheists just beleive in one less god than theists.