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we now know that Zeref's curse is from a god and since Natsu is supposed to kill Zeref and destroy his curse the curse of god then that means that Natsu has a god slaying magic which explains how he ate and used Zancrow god slaying flames.
further more Natsu is one of Zeref's demons which means that his magic is effective against demons and that means that Natsu is a Dragon God Devil Slayer .
Its more just Zeref himself that Natsu has to overcome, but the curse may play a part in it. Even though the curse is from a god, I'd say that its more Natsu's Etherious Power that will allow him to break the curse and kill Zeref, rather than him having God Slayer Magic as well.
I actually believe that Natsu is "nomathertheenemy slayer"
Back on topic... it is actually a very logical assumption, we still need to know how Natsu find himself under Igneel's care and his God Slaying magic might be dormant...
Now if he was made with the same idea as the devils from the book of Zeref does that mean that he is also a devil?, meaning possibily that the ultimate showdown could be between Natsu and Gray (if Natsu goes out of control?)
Well, people definitely seem to think the curse was from that ancserham god but we have no reference of ancsehram being a real being. We've never even heard of the guy until the last chapters. Its entirely plausible that zeref's curse was simply a side effect of some experiment he carried out or something and not the work of a god. Now, god's definitely exist considering there is god slayer magic but that is not proper evidence of this hypothetical ancsehram being a real thing.
This honestly doesn't make much sense. I don't know why he's being considered a Devil Slayer, since when has Devil Slayer Magic been necessary to defeat a demon. God Slayers are wielders of a very specific type of magic. Natsu doesn't utilise that type of magic. Therefore, Natsu isn't a God Slayer. It's unlikely to even be a requirement for someone to wield God Slayer Magic to defeat a god. It, like the other race-specific magics, is probably just helpful in that endeavour.