Only 33 percent of the planet is Christian. The majority of the people who are not Christian believe in a god or gods and worship their god or gods. They are not trying to rebel against god. They honestly think they are worshiping the correct version of god. They are not trying to do anything wrong.
So, if God loves us and he can see into the future and he is all powerful and he wants us to go to heaven, why doesn’t he himself to us in a way that he knows will get more people into heaven?
According to the Bible you would be destroyed if you saw God as he is, just a small amount of his glory caused the pre-nation of Israel to ask for it to be concealed in their terror from seeing it.
Further, God doesn’t want evveyone to be saved. Though liars love to pull the "For God so loved the world" verse out as proof God loves everyone forever and won’t send anyone to Hell, they are taking that verse out of context and forgetting or refusing to admit that "world" can be used in a generalized way, as in "all races" or "many people of all races" or "many people of many people".
Why else would the Bible repeatedly say that God will not forgive the sins of various people, and record him destroying them in horrible ways without hinting that he has any compassion for them? Why else did Jesus speak harshly against the Pharisees, almost all of them apparently, and all or most the Sadducees, condemning them as children of Satan, and keeping them blind to the truth of how to get eternal peace? Why else did he thank God for keeping that knowledge hidden from them, but only revealing to his "children"?:
Matthew 11:25
At that time Jesus said, "I praise you, Father, Lord of heaven and earth, because you have hidden these things from the wise and learned, and revealed them to little children.
Luke 10:21
At that time Jesus, full of joy through the Holy Spirit, said, "I praise you, Father, Lord of heaven and earth, because you have hidden these things from the wise and learned, and revealed them to little children. Yes, Father, for this was your good pleasure.
Why else did Jesus speak in riddles and the Spirit only allow certain people to understand what Jesus was saying?