I have a crystal ball, but i always fail at scrying, and have tried an uncountable amount of times. I found an alternative use but im not sure if i will get bad luck or not. I want to use it to communicate with the God and/or the Goddess, talking to the crystal ball and having the message go through to them. Will the message even go through? Will these messages or prayers be at all effective?
Try using a scrying mirror, for scrying experiances if using the method through the crystal ball does not work for you. Some methods are easier for some people to use and others not so much. Depends on the individual.
The scrying mirror for myself works well. (Not speaking for everyone)
And the whole thing about your beliefs is your beliefs, I can't really give advice to how to communicate with your deities or what have you. Everyone has their own way of praying/communicating with their spirits and deities. It is whatever they believe in/works for said person.
No matter who you're praying to, those messages will always be recieved. It may not seem like it, but our deities give us signs that we're listening all the time. You just have to be open minded.
Like, for example, I often pray to Hermes. I also often find pennies laying around everywhere. One of Hermes' attributes is Currency. So it would make sense knowing that He's listening to me, and that He acknowledges my presence.
It's just little things like that, that make you confident that They hear you.
There's also different methods for scrying. Like Sim said, there's the scrying mirror. There's also water scrying, fire/smoke scrying, candle wax scrying (dropping candle wax in water, and depicting images from it), and all other sorts of methods.