"Is Jesus God?"
That is one of the most important differences between Islam and christianity. The greatest crime I can possibly imagine doing is having partners beside Allah (swt). Even murder, rape, adultery do not compare to associating partners with god. And let me emphasize that I love the prophet Esa (pbuh) with all my heart and one day hope to meet such a great man in heaven, as I wish to meet Musa (pbuh), Yusuf (pbuh), Ibrahim (pbuh) and especially the prophet Muhammad (pbuh) who was a mercy to mankind. But God willing, I will never elevate a human being to the level of my creator. Therefore, in short, Jesus (pbuh) is not God almighty.
I could address Samatar's absurd reasoning, i.e. "I believe calling Jesus God is a great crime; therefore, Jesus is not God." (Notice the "therefore" in his claim, which makes it seem as if he has offered some argument.)
But a more important point is Samatar's claim that believing in the Deity of Christ is a greater crime than murder or adultery. What is the penalty for murder in Islam? Death. What is the penalty for adultery? Death. But Samatar says that believing in Jesus' deity is an even greater crime. Should there be no penalty, or is Samatar finally coming to see the "wisdom" of Qur'an 9:29?
Qur’an 9:29—Fight those who believe not in Allah nor the Last Day, nor hold that forbidden which hath been forbidden by Allah and His Messenger, nor acknowledge the Religion of Truth, from among the People of the Book, until they pay the Jizyah with willing submission, and feel themselves subdued.
Is Samatar now going to change his tune, claiming that the greatest criminals in the world (Christians) should be free to commit the worst crime imaginable, and to call others to do so as well?