I am really considering deleting my iCloud account. But I would like to know what will happen?
A.) have problems like it will erase data on my iPhone?
B.) will it mess with the back up?
C.) will it undo what has been done on my iPhone? I,e erased contacts?
D.) will erase everything of I update my iPhone after I've deleted it?
It asks you what you want to keep contacts on your iOS device. Your Mail will be gone, as it is residing in icloud and "offline" icloud mail ( without actually using icloud service ) is impossible. You fall back to your pop/imap mail services like yahoo,msn,gmail and so on.
You can backup idevice data and apps and content already now using iTunes as a optional thing( along with using icloud backup together ). But after icloud account has been deleted you can only backup with itunes to Mac/PC of course.
However if you use iOS iwork apps and had them set to save documents in the cloud, all of your office files will be deleted forever . So back up these using itunes or manual download to Mac/PC from icloud.com/iwork before you go on and delete the cloud .