To have faith is to be sure of the things we hope for, and to be certain of the things we cannot see. Hebrews 11:1, TEV
Someone I love is losing their faith in God because God has chosen not to heal him. In fairness, this person has lost a lot over the years, but faith in God is trusting in Him when His answer to our prayer is no.
I believe the closer we get to the rapture the more the devil is going to sew doubts into believers. We must keep our faith strong in the Lord. Whatever we have lost on this earth, will not compare to the glories of Heaven.
We must stay focused on our future in Heaven. This person has also stopped believing that Jesus is coming soon. Yet even if we had 20 more years of suffering it would still be worth it all, when we see Jesus.
As Christians, let us pray for those whose faith is waning. Often our words mean nothing to those who are close to us. Our prayers are never wasted.