First of all, this to me is a question that we all have to ask at some point, and which we all have to find an answer for personally. I believe that is was Blaise Pascal who stated that " “There is a God-shaped vacuum in the heart of each man which cannot be satisfied by any created thing, but only by God the Creator, made known through Jesus Christ.” I would have put it slightly differently. I would have said that there is a God-SIZED vacuum in each of our hearts. We all have a need for that place in our hearts to be filled, but in this world there are so many things that are bidding for that space, and sometimes we get lost in the shouting of all these different things trying to capture us. The truth of it is, if we took everything that existed in all the entirety of the universe, every last bit of matter, it would not be enough to fill that size of a hole. The only thing that can truly fill such an emptiness in our hearts is God, because He is the only thing of that size, and the only thing that truly fills and satisfies that need within us.
We were designed in the beginning to share a relationship with our Creator, but we lost that when we fell. Nothing in this world can take the place of God in our hearts, which is why so many people get lost in addictions and spending money on all kinds of distractions to try and satisfy that emptiness. There is nothing that makes us feel so empty and alone as achieving all that we thought would bring us that ultimate satisfaction, and then finding out that it has completely let us down. We all have examples in our lives, personal or otherwise, which show how hopeless an attempt it is to try and fill that space in our hearts with anything other than God. A quote from C.S. Lewis states, "And out of that hopeless attempt has come nearly all that we call human history—money, poverty, ambition, war, prostitution, classes, empires, slavery—the long terrible story of man trying to find something other than God which will make him happy.” We think that if we have all the power, or all the money, or all the possessions we want that it will satisfy us, but the truth is that these things will all fail us in the end.
Maybe the answer to the question is not that we NEED a relationship with God to live our lives on this world. But if we wish to live our lives as God truly intends, with hope, and joy, the promise of a new life with Him at the end of this one then yes, we need Him to have that hope. People struggle through life every day without God, but they never experience true joy or fulfillment. Everything that they achieve just leaves them wanting more and more, a hopelessness consumes them because they cannot satisfy that part of their lives that only God can. In order to merely get by in this doomed world, we do not NEED God, but we must realize that if we wish to truly experience our lives full of hope and joy and the promise of redemption, there is no other way but by Jesus Christ.
Every person must ask themselves, am I truly satisfied in this life? Do I have the hope that I really want? If the answer is no. then there is only one way to find it, and that is to find a relationship with Christ. This young woman has asked what is the need to have a relationship with Christ? The question I would ask is, what do you want from life? Do you see this life as the only one you get? or is this merely a waiting area, where we all are preparing for what comes after? If this life is all there is, then no one needs to do anything except live it in just the way that they desire, whatever way it is that will provide the most of that limited and fleeting satisfaction that you can get, go that way. But if this is merely the precursor to our true lives, then we had best seek desperately the truth in this world that will lead us to that true life. That truth, for many, is a relationship with Jesus Christ, and for very good reasons and evidence.
I hope that this helps you find some talking points with this young woman and I will pray that she finds her need for Christ. God bless you and thank you.