who says dante couldnt do the same thing
Because you don't have the facts to back yourself up, you only have what Dante has done in the source materials and while you could argue that Mundus was essentially Satan of the DMC world (which i highly doubt he is, that's a different argument mind you), Spawn took on God and Satan at the
same time and won practically without effort to boot.
However this is all assuming that we're pitting Spawn at his height against Dante at his height, if Spawn was at any of his previous levels of power, i highly doubt that it would be such a clean cut match, in fact if Spawn didn't have those powers going against Dante then i'd give Dante the win but it would be a fairly close match.