Here is an analogy I heard from Philosopher JP Moreland. Suppose I invited you over to my house to play Monopoly. I explained that the game would be somewhat different this evening. Here is the Monopoly board, there is the TV, here are some coins on the table and there is the refrigerator. When it is your turn, make any move that you want and let me know when you are done. So, you chuckle and rub your hands together in glee as you set hotels all over the board and then tell me it is my turn. I walk in and flip the Monopoly board upside-down, go into the kitchen and make myself a sandwich. Somewhat bewildered, you upright the board, set even more hotels on the board and yell, “Your turn!” I, in turn, casually approach the game and again flip the board upside-down, grab the remote and flip on the TV. Now, it would not take you long to realize that no matter what move you made in the game, it was useless and here is why. If the game as a whole does not have a purpose then the individual moves you make in the game are also without meaning. Your individual moves only make sense in the context of an overall purpose of the game.
If God does NOT exist then the individual moves that we make in our lives are also without meaning.We can pretend to give our lives ultimate meaning but in the end it only amounts to an exercise in self-delusion. The decisions we make on a daily basis only make sense if the universe as a whole has a purpose, and this requires God.