But, it is possible to argue against 3 in 1...
@PetrW
It's possible to argue against anything, if you make enough scriptures symbolic. And now, thanks to the work of Ken Johnson, there are many more ancient writings from the patriarchs who started the Israeli people that will need to be ignored in order to continue to support Unitarianism/Arianism.
When I got saved, I knew enough to know that I needed to enter into some sort of contract or agreement with Jesus. I was not fully on board with the Trinity at that time. So, I just shelved it for the time being.... neither rejecting nor fully accepting it. I then based my decision to move forward with Jesus on the scripture where he said, "All power has been given me in Heaven and Earth." I reasoned that All meant All and as such I was at the top with him... at least to the top that I was ever going to get.
After I made the deal with Jesus and accepted his offer, I knew I was saved. I knew it in my innermost being. Within about 2 months after that I knew that Jesus was God Almighty, the Creator of Heaven and Earth. It never was a fully intellectual ascent. It happened about 3am in the morning while reading the Bible. The word of God is truly alive. It is unlike any other book on earth.
Blessings to you on your journey.
Here's some background on the Testimionies of the Patriarchs of the Jewish people:
https://www.youtube.com/watch?v=eEJNByx-KME&ab_channel=KenJohnson%28BibleFacts%29