Kaika, why does your parent's joy annoy you so much? Have you taken the time to find out if what they are praising God for is indeed true? Has He changed their life?
You can partake in that joy, too, you know, if you take the time to understand it. If you really see a change in their life and in their actions, it would be worth it to have them explain things to you. I'm surprised that they haven't shared their knowledge and their faith with you.
It's change, Kaika, and we all fight it one way or the other. When something like this rubs you the wrong way, it's well worth finding out why. Don't depend on your feelings for that. Get the truth about it.
Seriously, you aren't losing your parents. It's you that is moving away from them because you don't completely understand what is going on and you're fighting it, Hon.
__________________
Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.