…but I need a more coherent defense against this statement.
Actually, you don’t. You’re not defending Catholic Doctrine. Truth needs no defense. You have passed on the truth. You’ve done your duty. If he doesn’t want to accept the truth, that is his problem.
Remember, it is not your job to convert or convince anyone. Only God can do that.
I was having a conversation with my Protestant family member. He firmly adheres to the thinking of “once saved always saved”. I showed him several verses that clearly do not support this thinking. His argument then turned to then this individuals were never truly saved.
He obviously realized the flaw in his thinking. Thus, he responded the only way that he could.
This made no sense to me,
It doesn’t make sense. Especially when coupled with the Teaching of Scripture. But, let’s look at it in more detail, in case it comes up again.
His argument then turned to then this individuals were never truly saved.
1st. Then why did they claim that they were? Tell him, these individuals were Protestants and believed in OSAS just as he does.
If they weren’t truly saved, why did they claim that they were saved.
2nd. Why does Scripture show examples of believing Christians, who tasted the heavenly gifts, and yet, they fell away? (Heb 6:4-6).
Now, in my experience, the next thing they do is pull up 1 John 5:13. So that you may know that you have eternal life.
However, St. John says, “I have written these things”. Well, that’s not the only think he wrote. What else did he write? He wrote, "
1 John 2:3 And hereby we do know that we know him, if we keep his commandments.
1 John 2:4 He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.
1 John 5:2 By this we know that we love the children of God, when we love God, and keep his commandments.
Ask him if he keeps the Commandments. Typically, Protestants claim it is no longer necessary to keep the Commandments. And that should knock him for a loop. Whether or not he is convinced, will depend upon God’s grace working in him. There’s little else you can do but show him the evidence.