Kunio Nagatani participation is credited as composition since the manga consists of the main story by Nagai and of several texts written by Nagatani related to the Kamasutra, not to the main story. Aikawa's grandson, Ryu, becomes involved when the mysterious cult attacking Ryu and his sassy girlfriend Yukari and ransacks his grandfather's apartment in search for information about the princess until Ryu witnessed as he discovered the manuscript which is actually was an ancient Indian sex manual called Kamasutra. So, Ryu goes to India to help his grandfather. There, he finds his grandfather's assistant, Shakti, who introduces him to learn the techniques which found in Kamasutra.
The point here is that both are atheists. Does it really matter to you if a Lutheran or a Catholic did somethingbyoundont like? Not really. You will just blame Christians/theists in general. Correct? Let's test this out. How many people referred to the bakers specific denomination vs him being Christian?