Original Manuscript of Mark Chapter 16 is up to verse 8 only

Muslims always ask us to try this what is being mentioned in these verses in order to prove that Christians are the real worshippers of God when we are on debates on them on the forums:

Mark 16:18 They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.

But they do not know that the original manucript of Mark Chapter 16 is up to verse 8 only. (see the photo below and click the image to see it larger)