Why do Christians debate people?

The real crux of the debate as I see it is as follows. There are Christians/people of faith in the world and there are people who are against that faith. Now people who believe in God (Christians) are trying to live their lives the way that God tells them (us) to. That means reaching out to others, preaching the word and praying. In the Bible we see that God is not willing that any one should die (that is to die in sin without knowing God) but he has given us free will so there will be those who will. The other side is represented by people who will declare, as loudly as they can, that They want to be “Happy” they want to be allowed to live “THEIR” life/lives the way THEY see fit. As soon as you make that declaration you show that you are living only for yourself, that is selfish plain and simple. You are living your life for you and only you. God tells us to live for others and for him. Now the Christian view is that there will be an afterlife, a shot at living for ETERNITY in heaven. The way to get there is through Jesus Christ. That means there is hope. This world is NOT all we have there is a time when I will be able to live a life that is perfect. Where there is no pain there is no worry and I can be with all those I have loved and that others have loved and this is something that I can lead other people to. How wonderful it would be for all who I know to be able to know God and to be with him in that love and care for ETERNITY. On the other hand the selfish person is basically saying I want to be happy NOW, I want to be happy HERE. There is no thought at all for any future, let alone eternity. So they are basically living without hope they are living this life basically saying “this is it, this is all I have available to me. How MISERABLE that must be. There can be no hope in that thinking because that means that the only thing we get is what this world offers us and what do we get from this world? We get too hot, we get too cold. We face constant hardship and struggle. We get sick we get injured we see friends and family die sometimes in Horrible ways. That is what this world offers. Entropy suffering sickness pain sorrow and finally death. How sad how miserable how depressing. That is why Christians try to teach people about Jesus, that is why they will tell you about his love that is why they will pray for you and that is why they have hope. They want to share that hope and yet all those others out there want to reject it insisting that this is it.