Ignoring God may not lead to any punishment after death.
But it will certainly lead to a punishment during life in the form of burnout due to chasing false idols and stress stemming from a disregulated nervous system.
I know because I was an Atheist for most of my life who believed that success alone was all I needed and I could manage all my fears by myself.
This led to a life that was quite successful on paper alone. I graduated with honors from a top university. I became a pro athlete. I worked at a hedge fund and I got a prestigious job at the #1 company to work for in the world at the time, Google.
But the whole time I never felt fulfilled. I chased accomplishment after accomplishment because I convinced myself I would be happy after I achieved my next goal. But not only did the fulfillment never come, I began to feel anxious about losing the status I perceived I achieved.
Would the world still respect me if I was no longer an elite athlete? Would people still treat me well if I no longer had a job they recognized? What if it all fell apart at once?
When you worship God or frankly anything but yourself, your mind tends to not dwell over such trivial concerns.
But those who live a life devoid of God will look to self soothe themselves to comfort. Drugs, alcohol, tobacco. Any synthetic dopamine to help offset the pain of uncertainty. And the trickiest part is you can be a "successful" drug addict. In fact, our society encourages it.
But eventually you will come to terms with the fact that you have been chasing false Idols. That you've been worshipping a false God. And then you have to make a decision:
Are you willing to risk giving up the status symbols that are coveted by a Godless society if it leads to a life of less stress, less anxiety and greater fulfillment?
If you are, you're ready to accept God in your life, even if you have no intention of ever going to church.