This is a critically important question. We were built to last. When our physical bodies die, our spirit and soul live on. But where? That depends on a decision we make now, in this life. We are either in the kingdom of darkness, or the Kingdom of light, God’s kingdom.
He made a perfect way for us to be saved into His Kingdom. It isn’t about being “good.” Everyone falls very far short of God’s standard. God the Son, Jesus Christ, came to earth and suffered the punishment for our sinful condition. All we need to do is turn away from our sin and receive Him as our very own rescuer, not only in our mind, but in our heart as well. When we give our heart and our life to Him we get real life in return. It’s amazing.
We can know for sure right now where we’ll go when we die.
“For this is how God loved the world: He gave His one and only Son, so that everyone who believes in Him will not perish but have eternal life. God sent His Son into the world not to judge the world, but to save the world through Him. There is no judgment against anyone who believes in Him. But anyone who does not believe in Him has already been judged for not believing in God’s one and only Son.” —Jesus Christ, John 3:16-18 NLT
“If you try to hang on to your life, you will lose it. But if you give up your life for My sake, you will save it.” —Jesus Christ, Matthew 16:25 NLT