My cousin wants to convert and I don't know how to approach this.

For context, we're a Catholic family and we grew up in a small Catholic town. My cousin, who used to be an atheist, has now been interested in converting to Judaism for a while now and I don't know how to approach the topic.

I personally feel skeptical about this given Catholic teachings perspective of Jews, but moreso about the current political climate (Israel-Palestine issue) and my cousin's violent tendencies. I fear that my cousin wants to convert to Judaism, apply for Israeli citizenship, and enlist for military service.

I may not have enough exposure to people with other religions but I am aware of them and I want to be accepting or at least tolerant. I value deepening knowledge and increasing social awareness. I really hope that this interest in Judaism betters them as a person and isn't a means to an end.

Please let me know your thoughts. Any advice is appreciated.