Summoned by Being Involved?! And I Was "God"??

Story:

The main character reached retirement age and tried to live comfortably for the rest of his life. But suddenly he was summoned to another world to help defeat the Demon King. In another world, his level turned out to be the lowest compared to others with whom he was summoned. Wait, I was called to become "God"? And all my stats are top notch?