10 For it was fitting for Him, for whom are all things, and through whom are all things, in bringing many sons to glory, to perfect the author of their salvation through sufferings. Hebrews 2:10 (NASB)
The basis of Pelagianism and Semi-Pelagianism are the very same as that of Islam or Hinduism or Buddhism or any other religion except Genuine Christianity. That basis revolves around Man’s Free Will and making a decision then receiving some sort of blessing or curse depending on whether the decision was according to the tenets of one’s man-made religion or not.