The same way any other other human being would, with compassion and understanding.
God factors not into either of those emotions, and therfore is not needed in order to practice.
In the end we all know,pagan,christian, atheist, or otherwisw that we are born unto a grave. We all know that we will have our time, and then will fade.
A calming voice and a hand to hold are really the best things I have ever been able to give a dying loved one myself.
I dont feel because I didnt reassure them that they woud float of into a magic wonderland with golden streets and diamond streetlamps, that I didnt help ease their way.