Indoctrination has characteristics, and groups that are indoctrinated exhibit certain characteristics, all of which I have noted among evolutionists.
I don't have time, but maybe someone famaliar with psychological assessments of cults and such could ID these characteristics and see if a similar pattern emerges with evolutionism.
Michael Ruse, himself an evolutionist, has recognized a pseudo-religious side to evolutionism and has written about it, and I am sure others have.
One thing you see with indoctrination is that the group derides the motives of their critics. They typically will not accept that critics are genuinely in disagreement based on an honest review, from their perspective, of what they know as true.
No, groups that indoctrinate people make their critics out to be evil in one form or another, not sincere.
That's what evolutionists do, as evidenced on this thread.
Another trait of indoctrination is to use propaganda techniques, such as the false use of imagery, and we've discussed that some on other threads, and is indicative of evolutionism.
Another form of propaganda is the use of false logic. For example, the term evolution can mean any change basically, micro-evolution, or ToE which is universal common descent. Let's call the first A, and ToE, B.
"A" is an important concept, valuable in many fields, and is not contested.
"A" is observed.
Evolutionists then claim because "evolution" equals A, B must be true as well.
On the surface it seems logical, and that's why evolutionists will spend pages upon pages explaining how their theory is so important to medicine or whatever.
But this is a trick because the word "evolution" has 2 meanings. Just because meaning A is accepted and important does not mean meaning B is the same, just because the same English word describes both. This is a form of propaganda and subtle brainwashing, and once again goes to the group trying to demonize critics as the enemy.
The implication in this false claim is that critics reject "evolution", the A meaning, when that's a lie. The critics do not reject A, but the other meaning of the same term, universal common descent as virtual fact.
These sorts of things are dominant thought processes within the thought of evolutionists, and are not scientific, nor even logical, at all, and are indicative of EI, as the OP discusses.