At first glance, some might think that samurai and Christian philosophies couldn't be further from on another. Many parallels and crossovers do exist between these two groups, both promote loyalty to their Lords over everything else, even if it means at the cost of their own lives. While the samurai were loyal to feudal lords and masters, Christians on the other hand are loyal servants to their Lord, Jesus Christ.
This makes for an interesting contrast and allows for great comparisons between the two groups of warriors, the samurai being physical warriors and Christians being spiritual warriors. Many of the philosophies of the samurai follow, the code of Bushido, can be applied to lives of practicing Christians in order to enhance their spiritual loyalty and devotion.
Great book for martial artist who also happen to be Christians, slightly short in length, but definitely worth a read.