2 Corinthians 13:5
5 Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates?
Can you prove to me that God Exist? Can you prove to me that you are saved? How about you prove to me that Jesus died on the cross. I know you are wondering why is he saying these things. Well there is a reason. Do you have to prove these things to the world? Well you can try but the world will have fifty other challenging questions the minute you answer the first one. All we must do is prove to ourselves that we have faith. Look deep inside and ask yourself if the faith is there. Think if the most unimaginable thing happened, would God be the one you turn to? If you can say yes than a spark of faith is there. If you believe one hundred percent that Christ died than you are there. Prove it to yourself. Set it in stone then just live the life of faith. The world will try to question you until you lose faith, but if you walk in faith eventually they will see the proof without you opening your mouth.