So if Keith says the guy was genuine in his religious comments,

What comments Don?
He swore by Allah and praised Him.
That is what Muslims do, and his religion is not disputed.
The strongest comment I have ever made is that "it could be argued" that the motive was purely religious.
It could be argued Don.

Islamists seek rule by the Sharia.
That is a political as well as a religious objective.
Islamism is a political ideology.
The politics of radical Islam, which is a religion.