Tom Newhall wrote:
"People say 'Aikido doesn't work.' I say 'No, aikido works. Your aikido doesn't work .'"
- Hiroshi Ikeda
This is a valid point of view because many aikido practicioners, not only O-sensei were and are Buddhist.
I like H. Ikeda's quote. As for the part of O'sensei being budhhist, may not entirely be accurate. He was a shinto devotee, not buddhist as far as I know.
Saying he is buddhist may be like saying the Pope is an Anglican and the archbishop of Cantebury is a Catholic. This being the closest analogy I can come out at the moment.