The Answer to heaven is God's oneness. But if you are still skeptical here’s an argument for you amongst many but to me it’s the one that makes the most sense. When you about to die will you turn to one God or many. God would’nt make it so complicated and confusing. It is also a very difficult time and one can hardly think. God had made it easier to hold onto one thought and this is the name of God. I hope I have helped in some way. Please think about it. It may just save you.