You're missing the point.
Beliefs inform actions.
He did what he did, because of what he believes religious. Just like the millions of other jihadists.
Just like with the witch burnings back in the day by christians.
I agree these people are deranged and delusional. Doesn't change what I said.
His beliefs drove him to this action.
I repeat my question: do you think he would have done this if he weren't a radical muslim?
I'll go ahead and assume that your answer is "no".
If the answer is "yes", then please explain. And perhaps give an example of a non-muslim beheading someone while screaming "allahu akbar" as punishment / revenge for "insulting" Mohamed .
Yes, you can condemn his beliefs. That doesn't mean the Koran or Muhammad or Muslims, in general, are accountable.
Some person taught them this. Someone taught them that this is what God wanted of them. That person is likely still alive and filling the heads of others with the same beliefs.