sickness as punishment

I have ran into a few believers who believe if you get a cold or some other sickness it a punishment for something in your life. Those are usually the believers who try telling people with asmtha they have some magical sin causing them to have asmtha and if they’d just repent it would be there. Now I do believe stress and bitterness can help cause sickness. I know that when a person is stress or holding bitterness it tends to cause the body to feel bad, but I don’t believe it’s from G-d, or it’s a punishement. Sometimes it seems colds or other things similar to that is our body’s of saying take a break. Now I am sorry to say this you can’t tell me a baby or child with illness is being punished by G-d, that’s not the same G-d I know. G-d is compassionate so why would he hand us a snake. He doesn’t want to give us something bad expecailly when we love him. I have a few friends who are believers, who children have something wrong. Sometimes I believe G-d allows it to happen, and that it’s the enemy testing the parent.
The question I have always struggled with is why is he or she so sick. I honestly have to say I never think it’s something the parents do. Instead I more likely to pray for that family, I hope I’d never tell someone it’s their sin that cause it. Sometimes I wonder if G-d allows things to build up faith of those going through it and those who are praying for them. I know when my grandma was very ill praying for her and watching G-d heal her in front of our eyes built my faith. Now when ever I have any doubt I start thinking about what G-d did for my Granny. That build my faith and for Granny it built her and I believe she has found a relationship with Yeshua. I wonder if she ever been on Stimerex ES or what they used trying to fix Granny. In all honesty I do not think anything the doctors did would have help Granny, I think prayer and faith in Yeshua is what healed her.
Now my grandma doesn’t say oh the priest can pray for me, or Mary, John or some other saint or Angel can pray for me, she usually calls me and ask for prayer for her friends or family members who need help. It’s been amazing watching Granny change and boy I have to admit her asking me to pray for her, with out me offering has made me feel great. Not because my prayer did everything but because Granny realized she doesn’t need to go to the Saints or priest she can go to other believers to pray for her or with her. So was my Granny sickness a few years ago because of sin, I don’t know but I believe G-d allowed it to use it to Bless his name, to grow faith in both me and my husband. Maybe to a point showing me, He still heard my prayers eventhough I went through some horrible things and held some bittness and maybe honestly a little anger with G-d. G-d didn’t punishment for that, he dealt with me lovingly and like a father would deal with a child who playing with a hot stove.