So... Inquisitors were Clerics in the past and even if this didn't fit the character, there are many other creature types available that could be used for a creature that investigates heresy e. g. Advisor. Will we get more Inquisitors? Inquisitor tribal? In these decks? Or in Norns Phyrexia (compare Inquisitor Exarch). We can assume the 11 previous creatures called "Inquisitor(s)" will receive a creature type update.
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Planar Chaos was not a mistake neither was it random. You might want to look at it again.
[thread=239793][Game] Level Up - Creature[/thread]
Historically I believe your mostly correct. In 40k though at least to my knowledge inquisitors can and do come from any background. Literally anyone an inquisitor deems suitable could rise to be inquisitor, or even inquisitor lord, themselves. From a lowly beggar with no name to a sector known high noble. Though it has to be said most who become such are screened from the orphan school known as the Schola Progenium, namely by looking for those with the best 3 traits for the job: zeal (usually religious), mental acuity & sufficient physical capability. The first factor being the main reason they fit the inquisitor job or cleric position later in life. I do hope though they indeed make inquisitor a more recognisable creature type in future because of this as you mentioned. Not sure how soon they will correct old cards though.
Not necessarily. Those of high rank can be quite traditionally zealous in a theocratic sense, but most inquisitors collect or use some form of heretical technologies in order to better fight against them. There are also those who both hold significant amounts of power and are also Carta Extremis like Kryptman.
The emperor spent most of his very long existence trying to purge faith from humanity's vocabulary, only to be worshipped as a god basically immediately after he "died." Faith and zealotry here manifests in the name of someone who publicly reprimanded his demigod son for having those exact qualities.
My point is, 40k is less of a traditional theocratic dystopia and more of a kafkaesque irony. The religious elements mainly exist to further that narrative.