Classicly

The Certainty of a Future Life in Mars is a science fiction story written by L. P. Gratacap, an American author whose writings include: Philosophy of Ritual, The Analytics of a Belief in a Future Life, The Political Mission of Tammany Hall.

Excerpts:

The extraordinary character of the story here published, which some peculiar circumstances have fortunately, I think, put into my hands, will excite a curiosity as vivid as the incidents of the narratives are themselves astonishing and unprecedented. To satisfy, as far as I can, a few natural inquiries which must be elicited by its publication, I beg to explain how this unusual posthumous paper came into my possession.