It makes no sense to me that there would be more than one God so I could never believe in polytheism.
Why do you think one God is a miserable job?
If you are unhappy with atheism do you think there is anything you can do about that? I do not like seeing people unhappy.
There is an end to this life, thank God, and I definitely believe there is an afterlife. What we will need in the afterlife are the virtues we acquire in this life, so even if you do not believe in God or an afterlife I think you will fare well since you have chosen the path of virtues.
My life is full of sorrow because I am in a life situation I cannot change, but I hang onto this promise because I believe in Baha'u'llah.
“O My servants! Sorrow not if, in these days and on this earthly plane, things contrary to your wishes have been ordained and manifested by God, for days of blissful joy, of heavenly delight, are assuredly in store for you. Worlds, holy and spiritually glorious, will be unveiled to your eyes. You are destined by Him, in this world and hereafter, to partake of their benefits, to share in their joys, and to obtain a portion of their sustaining grace. To each and every one of them you will, no doubt, attain.”
Gleanings From the Writings of Bahá’u’lláh, p. 329