For the ultimate in going wrong consider the following scenario; the Catholics are right and Hell is everything you wanted more than God in the worst possible way.
You do the brain map and end up with a perfect copy that thinks it’s you, but you actually do have an immortal soul and your very last act was to suicide yourself in an effort to effectively defy God. Thus, you chose go to Hell and your personal Hell will be to watch silently and helplessly as the copy of you takes over your mortal life and as time passes and it begins to change it starts making decisions you never would have... and you have to watch and experience it all... for eternity.
I’ll stick with my original meatsuit and trust in God because, even if I’m wrong, I’ll never know it and so won’t care.