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Half-orc is a Race of Type: Humanoid with both the (human) and (orc) subtypes. Type and subtype are not the same thing as race. Otherwise Aasimars, Tieflings, etc would be the same race and could take all the same abilities etc. As they are both Type: Outsider subtype:(native).
Racial Heritage could get you into in Blood God Disciple but neither Eldritch Heritage nor Orc Bloodline would. Still could be a good idea to pick up Eldritch Heritage later on when you can get the Improved version.