That's an interesting and a very direct way of looking at it, from a Christian perspective. The idea that all of humanity can be divided into two spiritual camps—those who follow Jesus and those who do not—is a common theological framework within Christianity.
This perspective often comes from the New Testament's emphasis on Jesus as the "way, the truth, and the life," and the sole path to salvation. From this viewpoint, other religions, philosophies, and belief systems are seen as part of the "everyone else" category because they don't center on Jesus Christ as the means to a relationship with God.
In this framework, the key distinction isn't between different faiths like Christianity, Judaism, Islam, or Buddhism, but rather between a state of being "in Christ" and a state of being "outside of Christ." It simplifies the spiritual landscape into a fundamental choice or state of existence.
It's a very specific theological viewpoint that emphasizes the unique and exclusive role of Jesus Christ in salvation, and it's a belief held by many Christians.