If I erase my phone will it erase everything from my computer as well?

iTunes and my iPhone 4 are having a really annoying disagreement. There are things on my phone that I no longer want on my phone (music, photos, aps, etc.) but every time I delete them off of my phone (through iTunes or through the phone itself) when I plug my phone back in and hit sync it all reappears on the phone and it's taking up too much space.
I want to hit the Erase iPhone button and delete everything and start from scratch but I don't want to lose my contacts.
My contacts are saved in the address book of my macbook - when I hit erase on my phone, will it delete it off my laptop as well?
I've reached my wits end with this contraption. Someone help me. 

Generally, you should back up your computer before you install any new apps or when you have something you do not want to lose.
If it has been one year (or 6 months or 3 months) since you last backup, anything since your last backup will not be able to get recovered if you need to.
Does that mean all my contacts would be gone? As far as I can tell they're being saved through iCloud
If you are syncing contacts and calendars with iCloud, deleting on the computer or the iPhone will not remove then from iCloud.

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