There is debate among the Christian community whether one can lose their salvation. Certainly in the Roman Catholic Church the doctrine of mortal sin is an example of this concept. Yet, if we live in fear of losing fellowship with God, we let Satan win. There is little the Evil One wants more than to make us believe we are not beloved by God - that our Father is on the verge of rejecting us at any given time.
While always understanding the immensity and glory and omnipotence of God, we do well to remember that He loves us so intimately that He has counted every hair on our heads. We have the joy of knowing we not only have fellowship with the Holy Trinity which will never be broken, we also have the privilege of living in confidence that our Father is continually loving us more deeply than we can ever understand.
In reality, just as the Holy Spirit moves in us to love God in the first place, the Holy Spirit will keep that flame of love alive throughout our lives - even when we stray or rebel. We feel in our hearts the separation between us and God, but the Devil magnifies it to the point where he wants us to believe there is a chasm between us and God that cannot be crossed. What we must remember is Jesus' promise that He will never leave or forsake us.
Christian, rest assured it is God who brought you to Himself, and it is God who will keep you in His heart. We are blessed to be His children forever.