Is there a scriptural support for "man are ‘half animal, half angel’"? The Philosopher and Critic of Christianity Ludwig Feuerbach wrote:


  “My only wish…is to transform friends of God into friends of man,
  believers into thinkers, devotees of prayer into devotees of work,
  candidates for the hereafter into students of the world, Christians
  who, by their own admission, are ‘half animal, half angel’ into
  persons, into whole persons.”


Is there an instance in the Bible when men are described as " ‘half animal, half angel’"?
There is a verse in Genesis that gives room for such interpretation:

&quot;When man began to multiply on the face of the land and daughters were
born to them, the sons of God saw that the daughters of man were
attractive. And they took as their wives any they chose. Then the Lord
said, “My Spirit shall not abide in man forever, for he is flesh: his
days shall be 120 years.” The Nephilim were on the earth in those
days, and also afterward, when the sons of God came in to the
daughters of man and they bore children to them. These were the mighty
men who were of old, the men of renown. The Lord saw that the
wickedness of man was great in the earth, and that every intention of
the thoughts of his heart was only evil continually.&quot; — Genesis 6:1-5

So, based on this text, some interpret that the &quot;sons of God&quot; were angels, who had sexual relationship with women, thus giving birth to &quot;half animal, half angel&quot; creatures.

When we consider the context of this text we can better understand what Moses is explaining. In previous chapters we are given a glimpse of two competing lines, the godly line of Seth and the wicked line of Cain. Having established the antithesis in the garden, after affirming that there would be a constant struggle between the seed of the woman and the seed of the serpent we are given snapshot pictures of each of these armies.
We see Seth’s line about the business of exercising dominion, in submission to the Lord. We see Cain’s line dishonoring the law of God and making names for themselves. But the future is not mere co-existence between the two lines. The drama builds toward the great crisis of Noah’s flood right here in chapter 6. The great change, what creates the great downward spiral of humanity on the earth is that the two lines come together as one. That is, the godly line of Seth, the sons of God, seeing how attractive are the daughters of men, the wicked line of Cain, decide to take them as wives. The end result, however, isn’t mere dilution. It’s not that the now joined line becomes morally lukewarm, but that evil spreads, grows, deepens.
source

I hope this helps.
Blessings!