Lying is a pretty serious charge. I have not been following this thread too closely, so I don't know.
Lying is deliberately declaring something you know to be false to be true. All of us probably say things that are not true at times, that does not make us liars. Mistaken or wrong, yes. But not liars. Are all of us certain every aspect of what we believe is the truth?
He is convinced his gospel does align with the Bible, and that yours doesn't. Calling each other names or accusing them of lying is not exactly conducive to getting people to change.
Again, all of us are probably guilty of that at times.
I believe there are many JWs who are saved, and probably many who aren't. Same thing for Baptists, Roman Catholics, Pentecostals, etc. What saves a person is believing on the Lord Jesus Christ. I believe there are saved people in any denomination that has Jesus Christ at its center.
Good on you.
There are a few here who are convinced that no Catholic, JW, or Mormon will be saved, they don't even consider them Christian.
I have no problem when a person defends their stance, even vehemently. But when it devolves to personal attacks, name calling, or calling each other "liar", no good will come from it. Sometimes it's best just to agree to disagree, and walk away.
Just my $.02.
(And I'm not guiltless in all this... It's VERY easy to get sucked down under another person's rock..
But I'm trying to improve, and allow it to happen less.)