The Vatican refused to assist your son and you are banished into the wood to rot because that's the only possible way to let the vessel die so the demon can end the possession by being unable to find new vessel.

You struggled to raise him in such wilderness but you managed to make it by. In the day, especially at noon, he is most lucid. At night, at times he slept, at times with nightmare but mostly, psychotic episodes. To prevent harm, you tied him up before bed

The priest said you must love him to have hope of warding off the demons.

One night

Henri: "Mom... It hurts... Please... Untie me..."

You didn't know it was the demon and untie him... All hell breaks loose. You are hiding in the closet with your glossary as he strolls about in the house. Blood leaks from your arm where he bit you.