This video is nuts -- an Indiana toddler took the mic at his church recently, and sang a hate-filled anti-gay song ... with the lyrics, "Ain't no homos gonna make it to heaven" ... and the crowd went WILD.

The video was reportedly recorded at the Apostolic Truth Tabernacle in Greensburg, Indiana --  featuring a young boy on the altar, barely old enough to walk, singing a song he was obviously spoon fed.

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