Oh the naivety...
No, @A Believer. You are essentially splitting hairs by saying that they just knew him as God Almighty. God Almighty is a translation of El Shaddai.
It is enough to say that there is no god after all, but the Judeo-Christian god in particular is derived from neighboring beliefs around the Middle East. The roots of the concept might go back to Amun-Ra, or even further, and also resulted in such gods as Zeus in Greek myth (and you are then to be reminded that the "Greeks" were a broad spectrum of people in the Mediterranean and Asia Minor with heavy Egyptian and Phoenician influence).
Honestly, we in Western civilization owe a lot to the Canaanites. They gave us our God and even our alphabet.