For some reason my app will not load. Not only that,every time I try to open the app it crashes my phone. I think it’s corrupted somehow.

Can I delete the app and reinstall without losing anything?

If you have your game linked to your facebook account, then yes it will be fine. If not, I am not sure how you can get it linked if it is crashing. First try clearing your cache and then logging in. If this works link it to a facebook account so that your progress is saved on their servers. If it does not work, I suggest you send in a ticket to support via the link in my signature.