Karmøy is an island. Skudenes was/is a parish which covered roughly the southern half of that island, with the little port city of Skudeneshavn on the southern most edge of the island. At some time periods Skudenes also contained sub-parishes known as Falnes and Ferkinstad so you might find records in those books too.
Langåker farm is on the west side of the island closer to the northern border of Skudenes with Åkra and Avaldsnes parish than to Skudeneshavn.
The governmental divisions are no longer necessarily identical with the church divisions -- so you must stay flexible. Old parish boundaries sometimes changed, and sometimes merged into others or separated out.