Theological disputes are not something unique to our time, or even the time of our ancient relatives.
Reaching all the way back to the first century we can find disagreements about important theological matters.
Jesus had his arguments with the Pharisees and Sadducees, not to mention those with the religious leaders of his day. Paul had to deal with controversies with church members as they were still learning what it meant to live in this new kingdom with its new covenant. And John felt pushback from those who insisted that although Jesus may have been God (there were definitely some who thought he wasn’t), he surely wasn’t a human being.