What are the reasons you don't believe this theory?

[tackattack]

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Let's say I come and say:

There are 12 gods that created the universe with the earth as it is and with all its beings, along with us. They have afterwards gone to another world, through a portal. Now one of them returned and told me the truth and told me to tell everyone that there are actually 12 gods and many other things about how things really are. I tell you these things, and they have logic, do not contradict modern science, etc. And then I tell you that if you don't believe what I've told you, then you will be punished by the gods after death.

I'm sure that none of you would believe me. So the question is: what are the reasons you don't?

I know a few reasons, but I am curios about your opinions.

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I know you were dying for a theist bite, and I have enough energy for a reply.
I wouldn't preculde that it was necessarily false as it is unfalsifiable. However you are not recollecting an experience, merely reiterating what this other God told you. Did you see him coming from a portal? Could we actually detect and measure this portal? Do you have subjective evidence (since that would be the most you have) that it is both productive and harmonious with the information presented that what you were told was true? Is the only potential for productive usefulness of believing postmortem?