Nearly all the bible has been borrowed from previous cultures. That should be no surprise to anyone.
So yes, it could be interpreted as “borrowed” from previous cultures, though that is not exactly how I would put it. And I believe in the age after the Church age, there just may be a yet more complete picture presented to those alive at the time of God and His relationship with man.
“Love the Lord your God with all your heart and with all your soul and with all your mind.”
and “Love your neighbor as yourself”
It is so simple, and it is my belief that is exactly how simple being a follower of God was originally. That's why nothing else is mentioned, because there was nothing else to borrow or steal from other religions.
Our relationship with the one true God was simple, and remained so for 1000’s of years, until that simplicity was distorted and perverted by those who demanded something more complex.