John Mcarthur believes that God selects people to be saved. He does not believe a person is saved by faith.
I think you are referring to the doctrine of being preordained. The Bible declares the Holy Spirit chose us before we chose Him [Jesus].
This does not eliminate free-will, rather it shows God, who created time, forenew any/all events [otherwise prophesy does not exist either!] including your particular moment of salvation. It’s simply two sides of the same coin or as I like to say, there’s only one reality.
If you believe in His work on the cross you are saved.
We must be careful of these people and what they teach and should avoid them.
But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed. As we said before, so say I now again, if any man preach any other gospel unto you than that ye have received, let him be accursed. Galatians 1:8-9.