@Nyrryl-Cadiz Thank you for your perspective, Nyrryl!
It’s not that I absolutely don't want to illustrate the book. I believe every project is an opportunity to learn and grow as an illustrator. My only concern was precisely about being labeled, as I have no prior experience in the field, so I was worried that illustrating a Christian book might lead to being seen exclusively as an illustrator of Christian books. So, it’s not about not wanting to do it. And I don't know when or what kind of next opportunity will come, so I can’t be so picky as to expect my first project to be a dream project for me. Anyway, great points from you, really appreciate!