@bikerbutter The earliest surviving Christian prayer is Sub tuum praesidium ("Under your protection"), a hymn seeking the intercession of the Virgin Mary. It dates to approximately 250–270 AD.
Given that the author was a Christian, your premise is flawed.
@joshwhitlatch O my God,
I firmly believe that you are one God in three divine Persons, Father, Son, and Holy Spirit.
I believe that your divine Son became man and died for our sins and that he will come to judge the living and the dead.
In this faith I intend to live and die.
Amen.