You don’t understand the main point of this essay. Many people - and that includes me - don’t believe in God, but believe in the validity of Christian ethics and culture. Like all religions, Christianity has two aspects, the spiritual (personal) and the cultural (societal): I am not discussing the former, but it is the latter that needs to make a comeback. It is the heritage behind which the West can rally, to give it a core, a sense of collective identity, a moral foundation.
One of the first people to alert the West to the dangers of Islam was Oriana Fallaci, who was an atheist but called herself a “Christian atheist”, because she understood very well that the West - and indeed civilization in its proper sense - cannot exist without Christianity.
That helps explain your lack of knowledge on the subject. It doesn't fix your supposition about Jesus re: animals. You try and apply a biblical outlook when the Bible is about Jesus not animals.
a moral foundation
Why pass over the OT then? The Law was given there.