Why did Jesus raise people from the dead, when they would have been in heaven?

The way I understand it from the bible is that you can live well you entire life, but if you lose your faith and then you die you won't go to heaven. So I'm sure that Satan would love the ability to raise people from the dead, take them out of heaven and get another chance to win them over. Yet Jesus (our saviour) seems to be the one doing exactly that. E.g. Mark 5 describes how Jesus raised Jairus' daughter from the dead. However at her death is she not in heaven? Is Jesus not doing her a disservice by raising her from the dead and giving Satan another chance to get her? And I suppose the same goes for curing deadly deceases. Edit: I did not know that nobody had gone to heaven before Jesus' resurrection. However I think my question is still relevant, it would just change my question to: When Jairus' daughter died, was she not guaranteed a place in heaven?