Nope.

Buddhism pre-dates Christianity by a few centuries.

sectarian schools have extra one subject made for their religion while non-sectarian schools just have the normal subjects

Sectarian: of or relating to sectaries or sects; confined or devoted to a particular sect.

Sectarian schools are associated with a specific religious denomination and often incorporate religious teachings into their curriculum, while non-sectarian schools do not have a religious affiliation and focus on providing a more secular education. Sectarian schools may prioritize religious values and beliefs in their teaching methods and school culture, while non-sectarian schools tend to be more inclusive of students from diverse backgrounds and beliefs.