This happens a lot to people who "find" phones.
Take it to Verizon and they will fix everything for you.
Little brother got on the phone and locked pattern attempts out. UN/PW for google didn't work. Called tech support. Told me to login to gmail and change my google passoword. Pulled battery on phone, rebooted, entered new password. Worked like a charm. (had full 3g service at the time)
And I think the problem you were having with ADB was that you needed to enter Su first?
Running SS5.6/Cushzero 2.3.7
Loving the Gingerbread deliciousness
O/C 1.1 Ghz Chevy low voltage kernal.
I had similar problem with my Motorola Xoom WiFi. My friends was playing with my tablet and they was trying to guess my login pattern. Unfortunately sign in via Google account did not worked and WiFi network was turned off. So I was looking for way how to unlock it without root access.
Finally I found it. I wrote an application which turns on WiFi. It is quite simple. There is one requirement, you have to have enabled debuge mode. After installing app via IDE (eg. Eclipse) WiFi is connected to known network and you can log in with your Google account. There is also possibility to set network parameters in app code before compilation.
I hope this helps someone with this problem. At the end I want apologize for my poor english