re: Rom 8:30,
the only thing which this passage is saying, is that the only thing predestinated or foreknowledged , is that thos who love God should become Christ-like.
It helps to read up a few verses. Note in Rom 8:29, they are being predestinated to be conformed to the image of His Son, not salvation. That is what the predestination is talking about, not that God would choose or not choose someone to be saved. Throughout scripture, the predestination is always in context of "in Christ" or "in Him", i.e. it is not about God specifically choosing or not choosing to save us. The only thing which God had predestinated was that people would be saved through Christ.
Rom 8:28 And we know that all things work together for good to those who love God, to those who are called according to His purpose.
Rom 8:29 For whom He foreknew, He also predestinated to be conformed to the image of His Son, for Him to be the First-born among many brothers.
Rom 8:30 But whom He predestinated, these He also called; and whom He called, those He also justified. And whom He justified, these He also glorified.