By my estimate, once you stop throwing him into the fireplace, it should take about three months for him to get accustomed to you.
To speed up this process, the cat must be breast-fed about three times a day. It would be wise to check in with your local dairy. Be prepared. Cows aren't cheap.
A possible substitute to this would be a lactating family member.
What the hell did ya do to him to make him react that way, poor baby lol
Yeah see that he's hiding from you with the reaction seen in that scary piccie I ain't surprised if you've been winding him up, perhaps you hide from him too lol 😉