Wow! It would take a whole thread for me to dispute things that website says.
I would suggest, praying to God about it. The Book did not put up and unscriptural red flags w/ me. I will just touch on their 1st point. " and the fourth, who is set over the repentance unto hope of those who inherit eternal life, is named Phanuel.’"
They went into a rant on why Jesus is the only mediator between us and God. That verse did not say anything about that angel being a mediator. That angel could have just been spreading the message of repentance. John the Baptist did that too.