Seemed an awful lot like American Christian fundamentalists in almost every detail.
Here are the reasons why I am of the opinion that the Krill religion is a statement about radical Islam, and not about Christian fundamentalism.
Paraphrased quotes from the episode, along with the video time stamp for each:
In most cultures, adherence to religion declines with advances in technology, but the opposite is true with the Krill. (7.25 minutes)
The Krill religion places the Krill above all other forms of life.
The Krill see attacking people as their divine right.
The Krill view war as a holy crusade. (7.40 minutes)
The Krill Call to Prayer is signalled. (14.50 minutes)
The religious script used on the 'chapel' walls and in the Krill 'bible' is similar to Arabic script. (16.00 minutes)
The Krill chant 'Hail Avis! Hail victory' - similar to Allahu Akbar! (God is Great!) when Muslim combatants achieve a victory.
The Krill also chant 'Ameem amadeen!' in the chaple when the 'priest' chops up a human head with a knife, which is also similar to the Muslim chant 'Allahu Akbar!'. (18.32 minutes)
The Ankana teaches that anyone not Krill doesn't have a soul. (26.25 minutes)
Other indicators that radical Islam is the inferred religion:
'Ankana' sounds similar to 'Koran'
Both Allah and Avis begin with the letter 'A'
The Krill priest wears ceremonial robes. Fundamental Christians don't, but Muslim clerics do.
The Krill behead captives.
The Krill use the severed heads as 'trophies'.
Now, I would like to see you post your own
*detailed* explanation as to why you think the Krill religion is an 'attack' on Christian fundamentalism, and not one attacking radical Islam.