ANSWER:

As long as he claimed you as his son and he is your biological father and your mother did not have any previous relationships when she gave birth to you, he is your father and you should maintain your ties of kinship with his siblings as they are your uncles and aunts. 

Your female cousins are non mahram to you and you must not contact them or communicate with them. 

QUESTION: I was born out of wedlock, my father is Christian and his whole family, my father accepted me and he told his family later, for now some of his sisters and brothers we communicate. So I’m still obliged to maintain ties of kinship, because some live abroad and we haven’t met, many cousins are girls, so how to maintain ties of kinship.