I guess it's just a figure of speech. Like, Kaiba is obsessed with money so much that he worships it as, among Blue Eyes, one of the few things he actually cares about in life.
Like < Love < Adore < Obsess < Worship
And some people might even say that some "otaku"'s/"weeaboo"'s obsess over anime/manga so much that they worship it.
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