what Do you think is the main idea William Butler Yeats is trying to present to us as readers?

In Yeat's poem of "The Second Coming", in class we discussed multiple parts in which we could see this poem in the sense of being biblical through the literary device of Allusions.  We can see Allusion in when the author talks about the The body of a lion and the head of a man. This part of the poem is powerful in how in the Bible, the devil is compared to a lion in how a lion will stalk on the sheep, who are represented as lost individuals without Christ in their life. So with the body of a lion and the head of the man we can see, that this imagery is representing the coming of the anti Christ, and how the head of a man is used as deception among those who don't understand the truth, of that of Jesus. This is how we can see how the beast is slowing dragging it's self after the people in the dessert, who are either believers, or common people who are under the danger of being influence by lies and deception. In class though we discussed how the body of a lion and the head of a man is represented as the Spinx statue in Egypt, and how this represented going back to older traditions, as well as the part of the poem that talks about "The best lack all conviction, while the worst
    Are full of passionate intensity" and my question to all of you is, do you think that this poem is supposed to viewed in a more biblical way, or in a way that supposed to use allusions as a supplement in order to break down to the main point of  to vanquish evil in the world good men must not just sit and stare, but to rally and come to oppress the adversity, what do you think?