Especially when the Bible says there is only one advocate between God and man? Please, I'm very curious.
Still, @Miss_E3, you were a little tactless in bringing up the argument. You began by immediately telling @Matt_Bonnetfolly1 all the ways that you think he is wrong.
This is a bad practice in debate. If you begin by telling a person they are wrong, they do not feel invited to a discussion, they feel accused and get angry and defensive. The last thing any person wants to do is listen to all the ways they are wrong. Even if you know that their beliefs are not right, you must not begin by accusing them of being wrong.
A better way to go about this is to ask questions about what exactly the other person believes. Let them tell you why they think they are right. Let them present their evidence. When they are finished, ask more questions. When they have answered all your questions, present your evidence and explain what you believe. Let them ask questions and give them answers.
An amazing scenario in this case is when you ask a question they cannot answer. Most people will ignore it, or sputter, or repeat themselves, or even get angry. This doesn't matter. What matters is you've planted a seed of doubt. They will go away asking questions of their own about what they believed.
Just so you know, @Matt_Bonnetfolly1, most of this is not for you, just in general.