I think your assertions are entirely wrong.
I would bet you that most of the slaves were practitioners of voodoo and not islam. I am not sure about this but it seems to me that most of the slaves were out of west africa... where vooddoo is chief. I dont think Islam was present in West Africa 200 years ago, however it is gaining a good foothold there now.
The ealiest muslims here were scattered among the slaves that were imported here.
Part of the curse on this nation that stems from the sin of slavery, IMHO.
Islam had most of Northern Africa by then and there were communities in the West as traders had been proselytizing. It’s a sure thing that a number of Muslims were among the slaves. But it’s irrelevant since they didn’t bring their culture with them for the most part.