... well not that one, obviously.
But if you are a literal bible believing Christian you have to believe these one horned beasties exists because your Holy Text mentions then by name, and not once either.
I bet you would be surprised to learn that there are actually nine references to unicorns in the bible: Numbers 23:22; 24:8; Deut. 33:17; Job 39:9,10; Psalms 22:21; 29:6; 92:10; and Isaiah 34:7.
And all you apologists that say "oh it's just a mistranslation of the Hebrew re'em and it refers to a wild ox let's just look at Psams 92 shall we?
"But my horn shalt thou exalt like the horn of an unicorn: I shall be anointed with fresh oil."
Horn, singlar. Last time I looked oxen had two horns.
And it's not a rhino either, despite what some fundies have claimed like this asshat here seemingly on the strength of its latin species name Rhinocerous unicornis - that's simply the Latin for "one horned" and the fallacy that it once had a "huge range"... it did that but it was to the east, not to the west.
So there you have it. If you believe that the bible is the true, inerrant word of God then you must, a priori, believe in the physical existence of unicorns.
You'll be telling me dragons exist next... oh hang on, turns out with 24 mentions by name we do!
Jeremiah 51:37 And Babylon shall become heaps, a dwelling place for dragons, an astonishment, and an hissing, without an inhabitant.
... and ...
Job 30:29 I am a brother to dragons, and a companion to owls.
Aw that's nice, I have that Job as a brother. Job, can you lend me a tenner until payday bro?