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Lots of untruths to unpack here.
Christians knew nothing of Christianity - false. To go through the sacraments of first communion and confirmation, you need to learn your catechism (what the church teaches/believes). This has been true even from the time of the apostles, as can be read in many of Paul's letters.

People were forbidden to read the Bible - false. The church was resistant to translating the Bible out of Latin into the vernacular as they were afraid that there would be a proliferation of bastardized versions, a prediction which has actually come true. Also, EVERY Mass performed contains readings directly out of the Bible. If the church didn't want people to know what was in the Bible, then why read it EVERY day at Mass?

I don't really understand your point about popularity in Africa. There were civilizational hubs along the Mediterranean such as Egypt in addition to those in Europe. Why wouldn't Christianity become popular there?

Never take religious advice from an Atheist who prefers to live in the dream of an unaccountable hedonistic lifestyle who gets all his hot takes from youtube videos that fit his pre-existing bias.

Haec sit vera

This doesnt match anything I have read from that era at all. This is probably jewish "look at the idiots" propaganda of the time like those fake interviews with americans that were from tik tok a while ago

All they knew in the Middle ages when the Bible was taught on the Latin which most people didn't know and the whole services were in Latin was that the goblins on the outside of the cathedral would eat them in hell eternally if they didn't keep paying the priests for their salvation.