Back in 2009, ads were placed on the sides of buses by atheists that had the following slogan: "There's probably no God. So stop worrying and enjoy your life." It's quite the catchy line. Yet it's not very helpful.
Have you ever talked to someone who left the house and fears they left the stove on or the garage door open? Aside from hard evidence, how do you attempt to assure them? You might try to get their mind off the doubt by changing the subject. You might tell them that this is something that never happened in the past, why would you do it now. You know what doesn't work? Telling them to stop worrying. Because if you tell someone not to worry, all it does is exacerbate their worry.
When the stakes are high (as if possibly burning down your house isn't high enough), to tell someone to not only stop worrying but to instead enjoy life can seem a bit trite and in most situations downright cold. "Stop worrying and enjoy life" is horrible consolation for someone who thinks they're next to be laid off or is waiting for a cancer diagnosis.
So to flippantly expect people to stop worrying about if their lives are actually ruled by a supernatural being more powerful, infinite, sovereign, wise, and omniscient than them who just might care about how they live and given them a purpose for living or realize they're just a pile of atoms and energy, slowly falling apart with no rhyme or reason, aimlessly hurdling through space and time seems callous and unhelpful.
Frankly, if you're an atheist, you need to be worried. Because you have to make every moment of your life. You need to recoup every second. It needs to all count, it has to matter at every moment because your value, worth, identity are being redeemed and purchased by whatever it is you're shedding blood, sweat, and tears for. It's always on the line, all of it. Even when you party, party hard, party right, party so it's epic and memorable because if it ends up being a lonely night with Netflix and Domino's pizza, you'll probably consider it a fail in light of how hard you worked during the week. You have to carpe diem the heck out of everything you do. But don't worry. Just enjoy it.
It's been said that worry for the Christian amounts to practical atheism. It makes sense right? If you believe in a God that's in control of all things, then why be overly preoccupied about all the details of life? Understand however that this isn't simply a call to fatalistic living. The Bible isn't telling you to let go and float into nothingness. Instead, we're pointed to Jesus Christ to see that He's won for us all things by His life, death, and resurrection. If God's pleasure is to give me His whole kingdom of heaven and earth and everything in between, then I don't need to fret over any earthly sandcastles I keep trying to build. Unlike the atheist bus ads which tell me not to worry and enjoy life with no place to set my feet firmly on, the gospel tells me to plant two feet firmly in Christ and know that He will never let my feet slip.
When I was a kid and asked for something from my dad, he'd always launch into a short parable about how if we were on a sinking boat together and there were only one life jacket, he'd give it to me. (He's not very good at answering yes/no questions.) He's told me this enough times now where he's mercifully shortened his answers to, "I've already given you my life jacket." It's his way of telling me to not worry and that he'll help or provide or whatever it was I need.
How much more can my Heavenly Father accomplish! How much more can He comfort and assure me that I need not worry! Because He points me to Jesus and says, "I've already given you my life jacket. What more do you need?"