To Black American Christians and Muslims alike!

How do a people legitimately come by their religion? For instance, how did the Arabian people come by Islam? How did the Jewish people come by Judaism?
So, how did Black Americans come by Christianity and Islam? Did Black Americans come by Christianity and Islam legitimately? You all should know is Christianity and Islam is legitimate for you all! I would want to know if I professed to be a Christian or a Muslim!
Simple things that you all should know you all don’t know! When you all are told right you all want to change things. You all can not change how God has set things up from day one!