Open PCSX2 config -> Memory Cards and ensure Mcd001.ps2 is plugged into Slot 1.
Sometimes, when booting a game, PCSX2 will tell you that your memory card is unformatted or the data is corrupted. Pcsx2 God Of War Save Game Memory Card
3. Method B: Import a Save into an Existing Card (Recommended) Open PCSX2 config -> Memory Cards and ensure Mcd001
If you want to troubleshoot a specific issue with this setup, tell me: when booting a game
God of War has notorious challenge modes ( Challenge of the Gods in GoW1, Challenge of the Titans in GoW2). To preserve progress:
The Ultimate Guide to PCSX2 God of War Save Games and Memory Cards