I found this...but then, you have to log IN to your account to do it, right? Likely not helpful.

I finally found the answer:
You can unmerge your accounts by going to your account settings, and at the bottom left, there should be a tab called "Manage Account." From there you can unlink the accounts.
For what it's worth, Laura, Gmail has an excellent spam filter - 99.9% of it goes straight to the Spam folder.