well. To Enter raid. you need 241k cp, minimum. Of couse, you won't deal any damage like that. But most people do it with cp like that because they have 2 people to carry them.
your gear doesnt rly matter because if u know patterns he will be unlikely to kill you unless you fuck up, what would most likely kill you with any gear
Becoming DPS in raid however, depends heavily on your class.
Some classes have it easier than others. An EtW for example, can rock the thing with a +11 VOID weapon and good Elrianode gear + set up, while others need a +11 FoJ to reach that lvl.
So well, basically, you need some top-tier gear, know how to play your class, use Battle Elixirs and Newt's Grace, have Elite/Unique HH and some really good stats to become DPS in raid.
Ofc, this is very simplified but I don't feel like writing a guide hehe