As a follower of Jesus Christ, I really hope that one day I can heal people but until God shows and gives me this power, I will remain very weary of anybody who claims they can heal people. Let me share with you what I believe is the case.
First off, if God ever chooses to do a miraculous healing with someone who is terminally ill, it will happen. That I believe 100%. It is God who will heal, not any Christians.
If Christians possessed such healing power, then why is it that none us visit hospitals and heal the sick, the dying, the children with Lukemia etc etc. After all, if we claimed to have healed people because of The Holy Spirit, wouldn't this lead more people to repent and believe in God? The very purpose of our mission. The great commission.
You see they don't visit because they don't posses healing powers. If you try and use the point that those in hospitals are none believers, well such healing don't happen in church between believers neither. Also, Jesus healed a lot of unbelievers that later became believers. Physical healing does not happen the way believers wish or say they have the power to do so. Yes Jesus and the apostles did heal and raise the dead but you need to understand that such power was to show that Jesus Christ was who He said He was. The messiah, God Himself etc etc.
Another point I want to make is that why would God allow us to heal people physically when He already designed our body's with immune systems that heal all by itself ? Coupled with the fact that there is almost a plant or herb available that help aid in our healing, take toxins out of the body etc. Cancer by the way is not a sickness, it is the last resort by the body to heal itself. Unfortunately it's radiation from chemo and other drugs that kill what good cells we have left. I will talk with anyone about this subject if they like but back to my point in hand.
It don't matter to God if we die in a sense that when we die we enter into eternity anyway. God wants us to turn from sin and be saved from the eternity of hell. If God was worried about how we die, He would prevent a lot of stuff but He don't interfere with free will. As a result from sin and how God cursed the earth, sickness and death are part of it. Jesus mission was never to prolong our life's but to save our souls.
It is appointed for Every human to die. This is the first death as a result of sin. How we die varies from cancer to gunshots, car crashes to overdoses and cot deaths to natural causes. I am sorry to hear of your sad news but incurable cancer fits perfectly with what I am saying. We are all going to die one way or another. Some tragic, others unfortunate and this will happen to us all whether we believe or not, have faith or not or follow Jesus or some other false God. So please don't ever listen to such rubbish from any pastor or other. Such foolish words lead us into guilt and I can see your point exactly. Do you think a loving father would make you feel guilty for something He could prevent.? Never! That only comes from the devil and your sin ridden consciousness. Jesus came to set us free from guilt and shame. Trust in His words and His alone. Never feel guilty for the passing of a family member or other because you think you didn't pray or have enough believe. I hope this helps and my prayers are with anybody that loses someone to death.
One final note that I personally believe because of scripture.
I do believe the healing Jesus promised us is spiritual healing. It is such healing to set people free from depression, addictions, suicides etc etc. If we battle not against flesh and blood (physical) but against powers of darkness and demons (spiritual) then that is what we need to be freeing people from. The battle for our souls are in our minds and that's where we need to heal people. It is easier to have negative thoughts rather than positive ones without the Holy Spirit within us. That's why we are called to renew our minds by washing them with the word of God.
God Bless Jonathan