Paul of Tarsus cursed all Trinitarians in Galatians 1 as Paul of Tarsus never knew about the Trinity doctrine and never preached or believed in this doctrine. Thus for Paul of Tarsus, the Trinitarians preach a different Gospel to him, meaning they are cursed according to Galatians 1.
Even if folks like Sam Shamoun and David Wood decide to give up the Trinity doctrine they will still be considered to be cursed by Paul of Tarsus as they are suspected of rejecting Penal Substitution. Here's what Brandon Hines writes about Michael Gungor in this regard:
By denying Penal Substitution, Gungor is rejecting the true Gospel and embracing another gospel, which is no gospel at all. What does the Bible say we are to do with those who bring another Gospel? Galatians 1:8 (ESV) tells us, “But even if we or an angel from heaven should preach to you a gospel contrary to the one we preached to you, let him be accursed.” [Brandon Hines]
For the Muslim, Paul of Tarsus has no authority whatsoever. Muslim don't care who he cursed. Can Christians say the same?
How Jay Smith, Nabeel Qureshi, Sam Shamoun and David Wood Contribute to the Apostasy of Christians
Geza Vermes on How Jesus Would Have Reacted to Trinitarian Christians
Is Limited Atonement Doctrine Taught Clearer than the Trinity Doctrine in the New Testament?
For Christians who say Allah is a Deceiver- a Message from James White
Oldest British Convert to Islam, Br Mohamed Keith-Kinglsey Cunliffe?
Faith Change: Islam rapidly grows as Christianity declines in UK
Slovakians converting to Islam
Faith Change: Islam rapidly grows as Christianity declines in UK
Slovakians converting to Islam
Notes from Sean Finnegan's interview with Patrick Navas: Is the Trinity Biblical
Tovia Singer: Does the New Testament Teach Jesus is God?
Why Islam
Tovia Singer: Does the New Testament Teach Jesus is God?
Why Islam
