I insist marsupials are just placentals who in some areas farthest from the Ark adapted a more productive reproductive system.
This is going to be my standard response to fundy nonsense.
Your beliefs have no effect on reality and evidently reality has no effect on your beliefs.
Instead of "insisting" how about some evidence or a reasonable argument to defend your beliefs other than "godidit".
It is unlikely or impossible for the original marsupial from whence came all sorts of marsupials to switch pouches back to front as needed from selection on mutation.
Can you support this assertion?
Facts don't lie or have an agenda. Facts are just facts