As everyone knows, aikido spirituality is based on buddhism (zen). Understandably so, given aikido's origin in Japan. If it was developed in Saudi Arabia, it would have been influenced by Islam and in France, by Christianity. I think aikido can be stripped of religion and embraced by Christians. I have explored how aikido complements and parallels the Christian message in my book,
From Kicks to Christ: The Aikido Way to God (avaialble on Amazon) and in my blog
http://yield2win.blogspot.com.