I'm sure you're right. The religious dogma quite probably refers to spiritual image rather than physical. Especially when the religious leaders began converting people who looked quite different from themselves.
BUT! I'm pretty sure your average religious person thinks of his god as being just like him, in form if nothing else. How many Renaissance artists would have been able to sell their works if they had portrayed Jesus as a 1st century Jew? Would the Sistine Chapel have been considered as beautiful if God had been painted with Negroid or Mongoloid features? No, I rather think that Michelangelo would have more likely burned at the stake as a heretic.
For better or worse, we make our gods in our own images.