The word is near you, on your lips and in your heart (that is, the word of faith which we preach). For if you confess with your lips that Jesus is Lord, and believe in your heart that God raised him from the dead, you will be saved. Faith in the heart leads to justification, confession of the lips to salvation. Romans 10:8b-10
Any doubt about Jesus rising from the dead, pretty much sums it up on where we stand with our faith. On shaky ground.
When we fall in love, we know with conviction that the other loves us. When we doubt the love another person has for us,it causes distress within us, doesn't it. We tend to not feel fully comfortable with this person. There are many things in our lives that bring us comfort, but none can bring a surety than the love we have with God. Or in the belief that Jesus came from God, for us to know love in the greatest sense. Without God (Jesus) we have no love. We have no life, we are but an empty shell, hollow.
It truly is in what we believe, Jesus rising from the dead we know without doubt the source of life. It's never too late to believe this.