Apostolic means to believe in the Apostles Doctrine.Yes
Acts 2:38 is part of the Apostles doctrine,but so are this verses.
Rom. 10-8,9:That if thou shalt confess with the mouth the LORD JESUS,and shalt believe in thine heart that GOD hath raised HIM from the dead,thou shalt be saved.
John 3-16:I believe that we all know what that says.
1 John 4-14,15:Whosoever shall confess that JESUS is the son of GOD,GOD dwelleth in him,and he in GOD.
Now you said that we must believe that JESUS is GOD,(And yes i do believe that JESUS was GOD manifested in the flesh)But the Bible says that we must believe that JESUS is the Son of GOD to be saved.
1 John 4-15;
Acts 8-37:
I Baptize in the name of JESUS CHRIST,and i know that is the wright way to baptize,but i know according to the WORD of GOD that when we truley believe and repent then that is when we are saved.everything else we do is a fruit of our savlation.And if a person hears about baptism in JESUS name and rejects it then they will be held acountable for thier disobedience.
But people can only walk in what they know.
I say let us live in the Love of JESUS and let GOD jugde others.Our responsibility as Christians is to Preach and live the Word of GOD,and let GOD deal with those who don't walk according to HIS WORD.Only GOD knows the heart of evey man.
But i am thankful that GOD is the judge of evey man,and not us.