Those who believe in the trinity believe that there is one God in three personalities, God the Father, God the Son and God the holly spirit and yet all these form one God.Trinitarians believe that the son, the father and the holly spirit are equal.We do not need to reason out this matter according to our own thinking.But rather, let the scriptures teach us.First, Jesus never considered himself to be equal to the father for he said "…Iam going to the father, for the father is greater than iam"-John 14:28
In his letter to the Philipians, the apostle Paul wrote-"Keep this mental attitude in you that was also in Crist Jesus who, although he was existing in God's form, gave no consideration to a seizure, namely, that he should be equal to God.…For this very reason, God exalted him to a superior position and kindly gave him the name that is above every other name." -Phi 2:5-6, 9
Additional references
John 20:17
1 Cor 11:3
1 Cor 15:28
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