Misinformation at it's finest whooooo!
First off there is no Christianity first AD do you mean first century?
No evidence of Christianity reaching Africa in the first century while in the end of the second century you could make an argument in Egypt, while it definitely was there in 3rd century AD.
Modern Ethiopia or called Abyssinia was a Christian nation during the 4th century bce by Frumentius who lived in the 4th century AD.
Christian text is written in koine Greek of the time not in Hebrew, Aramaic nor any African language but koine Greek and later adapted into Latin. So it wouldn't be until the 5th and 6th century that it is first written in an African script aka Ge'ez.
Now she is correct that Muslims were the first to subjugate Africans into slavery, but they pretty much enslaved everybody, while Western Christians imposed race based slave code.
While, it may not be the Christian way, but Western Christianity has done a ton of atrocities to African people and even Abyssinia has destroyed the Kingdom of Meroe the last ancient Kingdom of the Nubians in the name of Christianity and for Rome power to spread.
West Africans primarily African Americans were brought Christianity through conquest and colonialization not through free will unless you are talking about the Kongo Kingdom while they were still having kidnapped victims during the trade.
Christianity is rightfully deserved to having a real critique on it's history and let's not talk about the murder and rape of Hypatia who was also friends of Christians and who were her students murdered by Christian powers due to her beliefs, knowledge, facts, and her scientific viewpoint.
