In a video shared via private WhatsApp groups, the alleged attacker is seen being held on the ground inside the church, surrounded by people.
Amid the chaos, the alleged attacker can be heard speaking. He allegedly says in Arabic:
"If he [the bishop] didn’t get himself involved in my religion, if he hadn’t spoken about my Prophet, I wouldn’t have come here.
If he just spoke about his own religion, I wouldn’t have come."
The video reportedly shows the mayhem that followed the attack, with people in bloodied clothes walking around as the alleged attacker is held against the ground.
It is unclear who was holding him down and why, or if there were any authorities present at the time.
Bishop Mar Mari Emmanuel, who has a popular online presence, has previously criticised Islam and the Prophet Mohammed in public sermons.