I’m someone who left and came back, so I can speak to my experience.
I left for human reasons. As a teenager, the kids in my age group at Church were unkind. Bullying, judging, rejecting of others etc. It was hard to feel I belonged. So I left, feeling the Church had to be hypocritically unkind.
But I’m an innately spiritual person, so I kept looking for Spirituality all over, until I realized, due to personal things, that I had to come back.
I realized that I can’t change how people treat others, but I can listen to the word, to Mass, etc, and control what I do and how I respond, so i came back. I’m still shy of getting to know other Catholics, but I know it was the right choice to be one