In the literal sense, there are millions upon millions of people who do live without Jesus and who manage to do so and life a full life. For example, Christianity only has a following of 31.5%  which by your definition means that 69.5% of the Human Race can not be having a life even though they certainly do.
Actually what I am saying is that if the purpose of life is life but in this world we all die. So u need something more than just this life to fulfill ur purpose. And u said that people who r not Christians live their life to the full. That all depends what u mean by full. They live to die. Life is short friend. Death will quench life forever unless....unless Jesus is alive... like the eyewitnesses say....
Death is the great unknown and where death takes us is a question with no answer. Science fails us where death is concerned and only faith can provide us with a glimpse of what may lie ahead. I believe in a life after death but when I look at my faith, then my faith can not limit itself to a heaven or a hell with nothing to look forward to but an eternity of unchanging sameness. I belief that the soul travels from life to life and death is a pause in which the past is shed and innocence reborn.
If Jesus died and rose again we know where death takes us. Interestingly secular and Christian historians generally agree that Jesus walked this earth and that many his followers had to die gruesome deaths because they were so sure that they walked and talked with him after he resurrected. We believe the eyewitnesses of Abraham Lincoln assassination and they were not tested this way. Why not believe the eyewitnesses?
But do we know where death takes us? I could be wrong, but I don't think that Jesus ever shared with us where he went during his death or even what his death was like. All that we know is that he died and that he became alive again and that
in itself is not proof that we therefore need him to life again.
I like the way u think. Yeah next we need to know whether the eye witnesses were accurately recorded. The debate is whether or not we need to obey Jesus, right? That's another long topic. If u want u can text me at 506 391 5973 and continue this discussion or start another debate or whatever.
Reading back on it all, I do see that we have gone a bit off topic and that the topic "We must obey Jesus" is one that is worth exploring a lot further. I will not be able to do any more debating today, but I am interested in continuing this in a second topic.