Did you know that Jehovah's Witnesses believe that all people will go to heaven? That seems quite funny to me because they also say that God will not let bad people into heaven. If God won't let bad people into heaven, then how can all people go to heaven?

They also never mention anything about asking Jesus to be Lord of your life. It's kind of sad to see people who's religion is so close to Christianity, but lacks the personal side of a relationship with God.
They believe that they get to heaven by works. We know this is not right because of what the Bible says in Ephesians 2:8-9: "For by grace are you saved through faith; and not of yourselves: it is the gift of God: Not of works, incase any man should boast."
Give me one good argument against what I have just said.