This animated map shows how religion spread across the world
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1. It omits Manicheaism, which as I understand, had a significant following for a century or two. 2. I am kinda doubtful that Hinduism spread to Indo-China and Southeast Asia as early as 1000 BCE. The cultural diffusion happened much later, with the rise of the maritime kingdoms of Southern India. (One cannot really call it a religious conversion, since that concept isn't explicit in Hindu religious cannon)
https://en.wikipedia.org/wiki/Christianity_in_the_7th_centur...
Besides, There were other major religions before these 5 ones, and since they are not represented, they make it look like the world was "Godless" before they actually appeared.