I know that Southern Baptists have a peculiar attitude about even reverencing the body or saying ANY prayers for the deceased since they are in that “total depravity” mindset where the body is nothing but rotten good for nothing corrupt flesh and unworthy of any veneration. So I suspect that the rosary is less at question here than the more general question of: * “why pray at all for the deceased when ‘my bible’ teaches me we are not to seek to have idols nor contact the dead?”.*
I attended one such Baptist funeral of a friend and was stunned silly as to how indifferent they were to the corpse. I started to get teary eyed when I viewed the body and one of the family looked surprised and told me something along the lines of ‘why be sad - he is in heaven and that is just his empty and filthy used shell’. They sang gospel music and then at one point the preacher had a family member come up to give a quick statement about his life followed by the preacher using it as an occasion to do an altar call saying: *" ‘Brother Dave’ was a terrible sinner like you and I are and deserved hell like we all do. But heaven’s his reward just like we will get some day if you are ‘saved’ and just believe in Jesus. If anyone here wants to get out of their man made religions and false doctrines and come forward and accept Jesus as their Savior you can be assured of salvation too rather than go to hell for not trusting in only Jesus". *
They then went back to gospel music and in the middle of a song nonchalantly wheeled off the coffin to the hearse for delivery to burial with no one accompanying it to the grave sight. Instead they did a social afterwards and no one seemed interested in even knowing what cemetery his body was interned at when I inquired. I had wanted to say prayers over the grave-site.
So I suspect this is not so much a question about the rosary but more so a question about their belief in the futility of praying or mourning for the dead who are either in heaven or hell already. I think it comes from an exaggerated chauvinism for their contempt of the Catholic practise of praying to the saints and our reverence for the Communion of the Saints and paranoia about worshiping or conjuring the dead. They just don’t bother to think about God being omniscient and being able to hear prayers spoken after death in the “now of eternity” as if spoken well before a deceased person’s death like Catholics do.