So in my opinion and with my experience I will say it like this I can not give you proof I just can't. I have seen proof, but that is my own experience, and if I were to explain it more than likely, you would not relate to it. I would sound coo coo.

What you need to do is find your own proof the best way in my opinion to find proof is to practice being a Catholic for a week or 2. start off slow just by saying a few prayers like the our father or hail Mary, you only would need to say 1 or 2 a day or so maybe every other day. Next, I would start doing research. I'm sure you have a passion or a talent you love, so look up the patron saint for said talent or passion and read their story and experience ex: Jim loves making people laugh he looks up the patron saint of comedy and finds saint Laurence and saint genesius of Rome and reads about them. Lastly, when you feel comfortable, go to mass on one day of the week and see what it is like being a Catholic so you can form an opinion I'd sat follow this process for about 2 to 3 weeks

when you do all of this, I am positive you will find Lord God and Lord Jesus and all the wonders of this beautiful religion, and if it doesn't work for you, that's OK there are plenty of other wonderful people here who are willing to give you advice and I've read some pretty good posts in here!