@alannondarklord
Not as stupid as it might seem, they are dumb to not make sure he's dead though, or try to get him to join the church/king's faction.
From a power struggle mindset,the church and king would want him dead, you essentially have a messiah like figure who can revive anyone who didn't die from natural causes (if he can revive even from that, then he's basically a living god), this would put all of the church and king's power into question, and the mc could and probably would unite most of the people behind him if it challenged their power.
They also couldn't imprison him or make him a slave, if his power's that strong than he could literally revive random people just by being there, which would direct eyes towards the source.
Their best option would have been trying to essentially make him a loyal follower of the king or church, but they didn't even try to.
The 'hero's" party's actions however, make almost no sense, he was basically carrying them and even if they didn't need him anymore, what better power to have on your side in case shit happens than a literal deus ex machina, we have nukes that we'll hopefully never use, but it would REALLY suck to not have them to fall back on if things went really bad.