This is very plausible explanation. Scriptures, whether they taken from Tanakh, the New Testament, or the Koran, when describing 'god' and in order to try to understand god, they anthropomorphize god, or the assigning of human traits to something unknowable. Over time, this creates a belief system that god is actually these characteristics.
For early Israelites and Jews, they attributed, wrongly IMO, attributes and actions incorrectly to God.
Jesus comes and says I will show you god and how the laws should align by being god in flesh. The Jews rejected him. So in two very distinct instances, their view of the OT god, and then the man god Jesus, the Jews potentially mis-identified 'god' both times.
This is why I am not a fan of the modern "Bible' and the attempts of modern day Christians who try and harmonize the OT and the NT. In doing so, this creates hermeneutic hoops that modern Christians try to jump through in their defense that the bible is infallible and all the other attributes applied to the bible, when in fact, the bible never says this of itself. IMO, if you are a Bible believing Christian, your belief system should be entirely based the first four Gospels. Christians can toss out the OT for doctrine and theology.