This is a genuine question with genuine reasoning. I'm asking this question because I've seen Christian's across both Arminianism and Calvinism grow spiritually. I've seen people who believe partially between the two grow spiritually. I've even seen my own wife who still believes the eucharist is the body and blood of Christ despite me believing that hes present grow spiritually.
I've seen myself personally grow spiritually as a baby Christian who rejected the divinity of Christ and believed in works salvation, grow spiritually and into the Calvinist I am today. (it took about two years for God to remove these horrible beliefs from me but, he did without me ever going to Christ ever again and being born again twice)
Obviously it matters that we come to Christ with the right repentance and motives, it matters whether or not we live in sin, it matters whether or not we listen to the Bible and grow from the Bible. But does it really matter if you believe in eternal security or you dont? Or if you believe in Arminianism or Calvinism? Especially when I've personally seen Arminians grow spiritually and have seen my own spiritual growth and have seen Calvinists grow as well?
Here's another question. How can Abraham have uncountable descendants as numerous as the stars if doctrine really mattered? How could John have seen these descendants in heaven and confirm that the elect are in fact, an uncountable number? Probably billions and billions of people from only 6,000 years of history?
Either doctrine doesnt matter or I'm seriously missing something. I know Paul said that doctrine does matter but dont forget the heresies popping into his church back then and today. Many "Christians" are claiming to be such and live in sin with no conscience or care. They listen to these preachers who tell them they dont need Jesus to be saved. I'm not talking about THAT doctrine. I'm talking about Arminianism vs Calvinism here. Or Christian's that follow no denomination but the Bible sho grow spiritually each and everyday. I'm sorry but spiritual growth = Holy Spirit and Holy Spirit = salvation.