You began by accusing the author of being disapproving, that is, judgmental. Now at last you confess the truth: it is YOU who disapprove. It is you who are offended, not the other way around.
Now you claim that different ideas contradict and compete with each other. This is true. But your argument for examining them independently of each other is fallacious.
This is because light shines brightest in the dark just as good is seen against a backdrop of evil, sanity against insanity, order against disorder, truth against hypocrisy, and life, purpose, meaning, and hope against death, meaninglessness, purposelessness and hopelessness.
By unpacking and contrasting nihilism in its many historic forms against eternal verities, truth, purpose, meaning, hope and eternal life the author has shown that these two antithetical worldviews have been competing against one another since at least the time of Buddha.
It is truth and reality that offends you for you prefer the delusion.
And no, having a personal relationship with the Spirit of God is neither complex nor hard. His hand is open to all who seek Him.
ping to #25
For instance, the Buddha did not teach nihilism, and, in fact, he taught against it. It's true that he didn't believe in a creator god (because in Buddhism the view is that creation happens over and over, like a tide coming in and going out, eternally, and there is no original creation to require a creator) but that does not suggest that he taught that life is meaningless or without moral values. Quite to the contrary, he was very specific about life's moral values and purpose, which he believed was to live with compassion for each other and all other beings.
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Not only are Vedantists not nihilists, they aren't even atheists. Members of the Vedanta Society believe in the existence of a creator god with whom one may have a personal relationship. That's simply a fact. In addition, Vivekananda had no intention or ambition to convert the West to Hinduism. He believed that all people of faith are united in their mutual desire to improve the world, and that in their essence all religions are broadcasting the same message.
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We live in a world where Christianity is often misrepresented to its detractors, for instance in the Middle East and South Asia. If we want fair treatment from other religions, isn't it important to get our facts straight about theirs?