What about the tribulation saints who became Christians and died martyrs?
They went to Heaven.
Oh?
When?
Yes, the saints that come to Jesus after the Rapture are found in Revelation under the Altar crying out for Vengeance. Many Christians will be left behind to face the Beast. There are numerous Scriptures that say things like "Didn't we prophesy and cast out demons in your name", and Jesus told them "I never knew you." The foolish virgins are also Christians left behind. There are many Christians in name only that don't live the life and have not been in the presence of God for Him to know them. These are NOT lost people, however, their flesh lived on after Baptism. A person is to die in Baptism to be resurrected as a new creature when they come up from the water. You must be "Born Again" as Jesus told Nicodemus. There will be 2 types of resurrected saints in Heaven. The Bride that leaves in the Rapture, and the servants left behind to physically die at the hands of the Beast. The many parables in Scripture dealing with servants are those people. The only people who will be Raptured are the people that love Jesus and His coming.
Have you ever heard a Christian say, I hope Jesus wait's till next Fall to come because I have a cruise scheduled this summer? I have. There are some that say they want to see their Grand babies grow up. They will most likely be able to. There are some that say the Rapture will be after the Tribulation. They will be left behind because Scripture says, you must be watching for His coming or He will come as a thief.
The people that go in the Rapture will be the ones that Love Jesus and look forward to His coming. Jesus said, "If you love me, do my commandments." If you have one foot in the world and the other in the Kingdom, that won't work as you are double minded. If we examine ourselves, we must truly live our lives for Christ and not the world. Most people have no idea, and not much inclination to be a follower of Christ. As Paul noticed in Corinth, most of them were still on the milk and had no idea about the meat. All of the Apostles, save John perished for Christ, and John spent his life in prison for Him. Most "Christians are hit and miss at even attending worship services, never volunteer for any extra work, never read the Bible on their own, and have little desire to ever serve Jesus. Is the the type of wife you would marry? Neither would Jesus. Being a servant is easier except for the beheading part. Of course you could also take the "easy way" of denying Christ and taking the mark. Then you get to live no more than 3 more years and die of some plague and burn in hell for eternity. But at least you got to buy and sell a little longer.
Following the commands of Jesus should be easy for a Christian, but for some reason, people just want to keep living like they did while still in the flesh.