Perhaps I cannot go so far as to assume that xzins is not a Christian. However, persisting in error and impugning the gospel of Jesus Christ in so cavalier a way is not a mark of a gracious spirit.
This doctrine is highly dishonorable to Jesus Christ our Saviour. For (1) it entirly excludes him from that decree of predestination which predestinates the end; and it affirms that men were predestinated to be saved, before Christ was predestinated to save them; and thus, it argues that he is not the foundation of election. It denies, that Christ is the meritorious cause, that again obtained for us the salvation which we had lost, by placing him as only a subordinate cause of that salvation which had been already foreordained, and thus only a minister and instrument to apply that salvation unto us. (The Works of Arminius, Vol.1, p.630)It is Calvinism that preaches a 'false Gospel' that is why Calvinistic soul winners do not preach it, they preach like Arminians.