This is a very complex question.
1. High level Gentiles as explained in the Karma series can be cursed by the enemy relentlessly, as the enemy doesn't waste time on idiots and normal people with no abilities. So this can lead to situations like xianity taking hold or the high-level Gentile being surrounded by jews who are the 'only people who understand them' (often jews are the only people in the same IQ bracket as a very high IQ Gentile in any area) as a result of layered curses.
2. On the other hand, mediocre people with no guidance who can't deal with life can be attracted to something like xianity, pisslam or communism because it resonates with their low tier of consciousness and resentment towards living. In order to understand this, you need to read Nietzsche and other people.
3. Xianity has predominated for 1,700 years. Yes, it is questionable how much and to what extent - like for example, peasants in Switzerland in the 1700s thought the nazarene shit was born from a donkey. Many also couldn't understand the Latin language that nearly all church services were held in until protestantism came along.
Regardless, people have written this filth into their karma a lot. Many of the curses and inscribing here didn't necessarily involve needing to understand the bible, just being in its presence subconsciously, while entranced.
4. Dysgenics. Xianity glorifies and produces weaklings, cowards, the disabled, naive, and the list goes on in line with what the ideal xian of the bible is. The tiny amount of bioelectricity many people run on as a result of this nefarious program also produces disabilities and this extends into familial karma too.
5. Torture. People have been conditioned, hypnotized, tortured, kidnapped, sexually abused and beaten into accepting this thing. I'm not talking about the middle ages. In a place like Ireland with the Magdalene Convents, this is within recent memory. The cruelest aspect of this is the promise of 'forgiveness and love' which is a manipulation of humanity's highest instincts.
6. Benefits. This crap was the 'winning team' for so long, and for the enemy's worst traitors who got to, for example, molest any prepubescent kid they wanted while sitting on mountains of gold, it's a strong incentive from their twisted perspective to get involved again.
On the lower level mediocre people just do this in turn because 'my parents did it'.
All of this can manifest particularly in prominence of Neptune but it has a lot of formulations. The fundamentalist xian loon who shot John Lennon had a very malignant Pluto, Uranus and Jupiter working in tandem to create 'christ's soldier'. Dahmer had so much fucked up shit related to xianity moored to Neptune in Scorpio and Jupiter in Capricorn, his grandmother insisting he constantly read the bible made it worse.
Another thing... you now see a lot of religions like liberalism where fanatical xians of former lifetimes are converted into this world-resenting cult instead, because these people subconsciously hate the restrictions of xianity but they can't let go of the mind virus that is the core of xian belief.
The sinners are replaced with the privileged, the abominations are replaced with those who are problematic, mass and prayers are replaced with struggle sessions and diversity seminars, mobs of monks throwing stones at the impious are replaced by ugly and shitty people cancelling others on twitter. It is the same garbage.