How do I tell my parents I want to change religions?

I am Roman Catholic (Christian) and so are my parents, but I don’t agree in my religion, nor do I think I believe in God. I am not saying I am a atheist, I am more agnostic than anything and I am still on the fence in what I believe in, but I know I don’t agree with the Catholic philosophy and teachings. I have been studying a lot of religions like Hinduism, Native Spirituality, and Buddhism etc. I really like the teachings in Buddhism and I think it is a religion I would like to belong to. How do I talk to my parents (mother mostly) about this, and how do I “convert”? Do I just stop practicing anything with my religion, and start practicing the Buddist way of life?

btw, please do not take any offense if you are catholic or christian, I respect the religion, I just feel it’s not the right one for me.