God saves one way only. Either as taught by OSAS Arminian or Calvinism.

The difference is: are we fallen so that we can't choose the cross, not even by God's wooing and convincing by His Spirit and work on the cross by the Son of God (as taught in Calvinism); or, does the sovereign God save by this very method (OSAS Arminian) so that man as a sovereign being with free-will made in God's image may have the authentic choice such that no man is prevented from salvation without first regard for his choice and no man is saved first before being given the choice.

Remember too, Arminius believed in OSAS, except that he was uncertain about some verses by saying they only seemed like they lead to non-OSAS; but, he never gave up his belief in OSAS. To answer this problem, a learned Christian can response by saying those verses Arminius was referring to speak of loss of rewards in the millennial reign of Christ on earth with His overcomers; hence, there shall be some non-overcomer believers that lose the reward of reigning during the transition period between the age of grace and the new earth. Rewards are then done away with in the new city and new earth.

Praise the Lord for this discernment!