[quote=@Lunarlors34]
[@Caits]
How effective do you think God slayer magic would be against holy magic? Since it derives from a god (or something related to one), would it be effective?
And if so, how effective would it be against Manami's magic due to hers deriving from an angel rather than a god?
[/quote]

Hm.

Well. 

They are similar.

I'd think they'd have a chance either way to do damage. More on skill then anything else there