Jesus said that the Kingdom of heaven is inside you, he never said that heaven is a place that you go to after you die, that is an old pagan belief. Jesus' true message is that the Kingdom of heaven is inside you and all around you right now, that is what the early Christians believed. Nowhere in the Bible does it say that heaven is a place you go to after you die. Nowhere in the Bible does it say that God is an old man with a robe and beard that lives in the sky, that is an ancient pagan belief, there are many pagan beliefs that have been adapted to modern mainstream Christianity and people don't even know it.
Jesus the Christ message was very simple so that everyone could understand it, because it is meant to be understood by all and not a mystery: we are all a part of an infinite God, the Kingdom of heaven is inside of us and all around us, what we do to others we do to ourselves, love your neighbor and yourself, never worry, be grateful and content, because you are always provided for, you are to have life and have it abundantly.
He never made a statement on original sin, dying for sins, the ten commandments or any old testament story. He condemned religion, Pharisees, and false prophets. God speaks to each of us individually and entwines with each person to the degree they are prepared for, so it is only out of ego separation that one feels compelled to impress their version of God, which will be limited by the fact that it is not possible to fully explain the nature of infinity.