I was raised roman catholic (Christianity) and converted to Buddhism (no specific school or form) about 6 years ago. Those 2 are very different. While being catholic made no sense for me and therefore couldn't help me, I tried Buddhism. Buddhism isn't a religion per se but rather a guide to a life with less suffering. In my case I found a lot of teachings to be true because I actually experienced it. It's just like you can't prove if someone else is truly happy or sad, but you know these feelings exist because you experience them yourself. Some things can just be proven by yourself through experience. (That's why Buddhism falls under the category of philosophy since that's its definition)

Buddha himself taught to not blindly follow his own rules but to think about it critically and only accept what has been found truthful by yourself. Meaning Buddhists are supposed to always improve their knowledge. Therefore a good Buddhist would be happy to be proven wrong.

What really surprised me is that I often used buddhist teachings without realizing it. When I quit smoking or when I started to eat vegan I came to the conclusion that i was confused by a whole bunch of lies (smoking is relaxing, eating meat is necessary to stay healthy,... and what not...) after realizing that I don't need any of that to be happy/healthy it became very easy to change. I found out that my life is much better now in many ways. Then as I do sometimes, i read something about buddhism in that case about desires (you know, that cliché of the indian guru saying "you must let go of all desires") and all of a sudden I realized, "hey, that's what i've been doing (partially) for weeks now and the results are as said". So how could I not believe in it? Like when learning physics, you learn a formula as it is and in the progress of learning and by using it you start to understand how that formula came to be and why it can't be otherwise. But just like a smoker shouldn't be scared of quitting because of withdrawal symptoms an ongoing Buddhist shouldn't turn away just because he doesn't understand everything immediately. As long as you try out new things and try to improve yourself you will make progress. Don't let yourself get stuck on definitions especially when it's about religion. I doubt that there is a religion that is 100% perfect for anyone but you will never know if it's true if you haven't tried it yourself. You seek proof but, ironically, what you get can only be words (like this comment) and you have to believe it since there can't be proof for it. Like we know that molecules are made out of protons, neurons and electrons. But have you ever actually seen any proof for it? Like: have you ever seen/measured an electron? In fact no one can and has, but it makes sense mathematically that they are there. And all the experts agree on that and no one has ever shown a believable theory that disproves it. So is that enough to be proven for you? If so, think about all the Buddhist who suffer less than others, they all agree on the same basics, no one could ever disprove them so does it make it proven? In my opinion both examples are as right as they can be and if someone can show me a better guide to life or a better way to understand physics, then I will follow that.

The most important thing to remember is: You have nothing to lose if you try out Buddhism. And don't give up to easily, some things are really hard to understand.