Whether you believe it or not makes no difference at all. There are spiritual laws put in place by God himself much like the laws of gravity and thermodynamics in our galaxy which cannot be bent or broken.
One of those laws is "you get what you give" or "you reap what you sow".
If we build a life of selfishness, greed, deceit, violence and sin - we will only end up with a result of corruption, death and eternal separation from God in hell.
If we choose to build a life on Jesus - The Rock of God - and His ways we are promised peace, hope, relationship with God and a guaranteed final destination in Heaven with Him.
The choice is up to us alone. Choose life or death. There is no halfway.
Do not be deceived: God is not mocked, for whatever one sows, that will he also reap.
Galatians 6:7 ESV
