I would like a source that contradict the general view of Emperor Ashoka. It'd also be a pretty interesting read. The general view, as far as I've seen, is:
Ashoka killed many of his brothers fort eh throne.
He converted to Buddhism after the bloody Battle of Kalinga.
He accepted everyone and every other religious, ruling zealously and piously, going on Buddhist missions.
After his death, Buddhism declined in India and his empire collapsed, but not before his heirs managed to convert Sri Lanka to Buddhism.
So far, I've tried googling "AShoka wasn't Buddhist" but nothing has come up. I'd really appreciate the help, thanks.
John Keay in India: A History has a very readable take on this: basically, the idea of "converting" to Buddhism is anachronistic. Buddhism was simply one of a number of heterodox religious sects floating around India at the time, so it was less him abandoning one religion for another and more him finding inspiration from a particular set of teachings that did not contradict his old beliefs.
That being said, the evidence for his support of Buddhism is overwhelming. Asoka is mentioned in Buddhist Puranas, his rock inscriptions give the injunction to follow the teachings of the Buddha, and there are Buddhist stupas built under his direction. His rule also corresponds to a spike in missionary activity, likely due to his patronage.