I guess pagans (or Celts) never borrowed Christian traditions for their own fertility rites. I still maintain neither Jesus nor His disciples celebrated or had even heard of Easter.
Of course they had never heard of the word "Easter".
If you mean to claim that the early Christians didn't have a special celebration commemorating the resurrection, which they called (if they were Greek speakers), pascha, then I should point out to you that there were disagreements over the date on which Easter (Pascha, Pesach, Passover) was to be celebrated before the last apostle had reached room temperature. Google "Quartodeciman controversy".
Easter (or Pascha, if you prefer) is the earliest distinctively Christian celebration we know of, except for the celebration of Sunday as the Lord's Day.
The New Testament is a collection of texts written by Catholics to an already existing, nascent, Catholic Church. It is solely due to the authority of the Catholic Church you even have a New Testament to try and attack the Church Jesus established (Matt 16: 18,19). Google "Didache" and see what the Disciples of Jesus did.
Unless you are part of a Church which worships Jesus as He Himself taught us to Worship God, then you are on the wrong path and wasting your time castigating long dead pagans.
To worsship God in spirt and truth one must participate in the Sacrifice of the New Covenant and the New Covenant meal. That IS what the early Christians did - it is even in the Bible. Ask me sometime and I weill point it out to you :)