That answer depends on the religious views of the person answering it.
Christianity
to convert Africans to Christianity
Close Ties and Christianity.
I don't really know that is why I need you to tell me the answer
You really need to narrow your question down a bit. A lot of Jews embraced Christianity, and, over the next several centuries, a lot of pagans embraced Christianity.
the africans were untreated and it really wasnt fair for them.
Factually speaking, Christianity is the largest growing religion and continues to grow in large numbers, Millions of Africans Convert to Christianity every year. Christianity (Mainly Protestantism) has also spread rapidly in China, about more than 60 million have converted.
no
Yes Christianity is the only way forward.
They were missionaries, one famous missionary was Dr david Livingstone. The most successful missionaries were African Americans, after being freed as slaves. Africans were more willing to listen to the teachings of fellow africans than Europeans.
No they dont need a visa.
There have been Catholics in every century, in nearly every country in the world. Christianity, as such, does not really need animals, if you are asking about civilizations, you need to ask a more specific question.