Well you are the one who is wrong
The verse youused proves this
Jesus said he NEVER knew them
If he never knew them, they were NEVER SAVED this NEVER a true believer
You are totally wrong! 1 Timothy 4:1 "1Now the Spirit expressly says that in latter times some will depart from the faith, ..." this faith is the true faith in Jesus. They had it once but then they departed from it. So they were true believer in the beginning but later they left it for some reasons (money, power, wealth, etc.)