Could you show in the NT where any of the original apostles of Jesus called Paul expressly an 'apostle' in the same standing with the original apostles in Jerusalem?
Most of Paul's claim of 'apostleship' was from his own mouth,...see how many of the epistles attributed to him (not all are authentic, some are pseudographical)
are his own claim. That Mattias was chosen is clearly stated, although not too much is further shared about this man and his work in the ministry, as far as I know. If he was officially chosen 'by lot' (an acceptable form of divination, mind you)
- then he would be numbered among the 'original 12 apostles' of the Lamb,...and Paul is NOT given this honor or appointment.
While I do not deny any divine inspiration or insights given to him (as a teacher of the Christ- archetype and inner divinity, whereby 'Christ' in us, is the spirit of God working in man, transforming him into the 'new man', 'new creation', etc.),...most of his 'gospel' is allegorical teachings received by
personal revelation, which he accredits to Jesus (more of a cosmic-Christ figure who is a life giving spirit), and even his Damascus Road experience, is a kind of 'visionary' experience, there being differing accounts.
Paul basically appointed himself to be the apostle to the gentiles, and was in trouble (butting heads with the apostles of Jesus from the Jerusalem Assembly) more than once, most notably his incident with Peter shared in Galations (and oh his boasting!), and that in general the traditional orthodox Jews tried to throw Paul out of the Temple grounds as one who taught against Moses (the law, prophets, customs, etc.) - Paul was a major heretic to the orthodox who spun his own gospel and created his own 'Christology' as it were, with some Gnostic groups claiming him as their teacher of the 'inner secret teachings' (see Valentinian Gnosticism, as one branch). But we could go on all day about Paul......
Oh, by the way,...so far no one has proved Jesus is YHWH, and there appears to be plenty of support that Jesus is not YHWH in the OT,
if indeed the YHWH in those texts was/is actually Our Benevolent Loving Heavenly Father.
If YHWH is our Heavenly Father, then Jesus could NOT be him of course (even by rule and creed of orthodoxy, being careful NOT to 'con-fuse' the persons). However as I noted earlier, some of the actions/commands of yhwh appear to be quite contrary to a god of mercy, love, grace and compassion. - but then again, maybe war, genocide, blood sacrifice, slavery can be justified by a 'god' who deems his own actions 'right', because after all,...he is 'God'. ( on this count, how many are merely making 'god' in their own 'image'?....just 'like' themselves). All are engaged in this in one form or another to varying degrees,....and even now at any moment in time, we are holding a 'theology' that suits us. One may grow tired of a particular 'suit' and try another, or find another more 'orthodox'
- and so points of view are subject to change.
So hoot and holler as you like,..."the Father is not the Son, and the Son is not the Father. And after you say this 3 times",...maybe your head will spin.