Here's why:
* Scientology is not a traditional religion. It's a philosophy and religious practice that promotes spiritual growth through self-awareness and self-improvement.
* Cruise's involvement with Scientology is a personal choice. He became interested in the teachings of L. Ron Hubbard, the founder of Scientology, and found a sense of purpose and meaning in the practice.
* His involvement began in the early 1990s. He started studying Scientology and became a dedicated follower.
It's important to note that while Cruise has been a vocal advocate for Scientology, his personal beliefs and reasons for joining are his own. It's not about converting from one religion to another, but rather about finding personal meaning and growth through a specific set of beliefs.