Islam requires reciting a short sentence with conviction.[
https://www.webpages.uidaho.edu/~msa/tour/ch3-6.htm].
Christianity requires (depending on who you ask/sect) - believing in Christ as your savior, or baptism, or being confirmed. Generally not an arduous process.
Hinduism, you believe in the Dharma, and as long as you aren’t angering people enough they kick you out, you are Hindu. Some would argue, as long as you don’t believe you are something else, you are Hindu. Notably, caste can be tricky. There might also be a form you should fill out.[https://hinduism.stackexchange.com/questions/407/is-it-true-...]
Buddhism, you join the Sangha (show up), or follow teachings. There is no test or anything. Many Buddhists don’t directly do those things, and I’ve never heard anything say they ‘weren’t Buddhist’. Maybe a terrible Buddhist, but what else is new?
By those standards, is not Judaism the toughest and most difficult? Personally, I’d take it as a point of pride.