Re: Funakogi Undo
I think you're oversimplifying what has been said about the dual nature of the exercises. If, however, the "spiritual" is a turn off for you, maybe you just politely shake your hands while mentally going through your shopping list. Or maybe you suspend disbelief -- not the same thing as adopting belief, IMO -- and try to see what may be there in the exercise. Or maybe you decide Aikido is a cult and walk away.
In the end, as Mark said, your training is your own.