Ustadh Hassan, I asked this on your FB but I think you must have missed it. Also it is a bit weird when a stranger ask such direct questions from out of the blue.
I hope your response will benefit others like me who are still searching for the truth.
As a deist and not to believe in the afterlife strikes me as akin to the polytheists at the time of the Prophet.
There is a breakdown here as deism is not polytheism. Polytheism is to believe in multiple Gods; Zeus, Ares, Athena, etc. Deism is still a single creator/god concept. It just dismisses revelation focusing on arguments from nature and logic. Most arguments for God outside of religious texts are deistic. First cause and Kalam are arguments from a deistic point not a revelation.