If there is an afterlife, why the hell would it be rebirth?
That's like taking a piece of crap that's just been disinfected and then putting it back through the process of being infected for reaching the stage if disinfection... Lol wut?
Hindu god is a troll God, no wonder he has so many forms.
So your argument is that the afterlife can't be rebirth because rebirth resembles eating feces and eating feces is disgusting. You are basically saying that rebirth can't be true, because you find that idea repulsive. I find the idea of war repulsive, doesn't make it's existence untrue, so this isn't a good argument.
If we're to accept both what we're able to measure/observe AND the concept of an eternal soul/afterlife, rebirth/reincarnation would be the simplest explanation that accomodates both. A given soul (or measure of 'soul units,' which would seem to be more accurate; I'll get back to that.) wouldn't have to leave this world to occupy a new body or bodies; an afterlife not of this world eg. heaven or hell would require that the departing soul travel there, and would also necessitate creation of new souls when new beings are born; this would mean that what we call a soul acts entirely differently from every other phenomena we've seen as there is no conservation.
The problem with direct rebirth/reincarnation is that the number of actual organisms is in pretty constant flux; note the human population in particular. If an individual 'soul' is indivisible, then this still necessitates creation of new souls, as the human population is rising. But what if rather than an indivisible 'soul,' a given beings soul is comprised of some basic 'soul unit?' The Buddhist karmic cycle cautions that the cycle of rebirth could eventually have a poor specimen of a human inhabiting the body of an animal- why stop there? Perhaps a fallen human soul is broken down into smaller units and distributed amongst newly born organisms; say a few thousand or hundred thousand insects or something to that effect. While I don't have figures on the population tendencies of life on the planet in general, human activity encroaches on that of other species as well; how many plants, large animals, small animals, etc. are destroyed in the process of clearing a single acre of land, and how many people can that acre support? It's entirely possible that the number of 'soul units' remains constant, with each individual soul being made up of a number of these units, possibly based on the complexity of the organism in question, possibly not.
At the very least, this would render the idea of a soul at least somewhat consistent with other phenomena we observe.