My dear friend. I have no desire to argue with you and I certainly do not want to give the impression of disrespecting you......BUT you are completely in error here. YOU are the one whose eyes are closed to Scriptures.
The truth is just this simple......There are NO Scriptures to validate............
Purgatory.
Sinlessness of Mary.
The Assumption of Mary.
The Veneration of Mary.
Praying the ROSARY.
Please understand, I am that there are NONE, ZERO Scriptures to validate those teachings and that is only 6 of probably 30 or 40. Do you want to go on????
You are correct there are limited scriptures for this so the Bible implies these teachings . Just as there are no scriptures for altar calls , saying the sinner's prayer or even accepting Jesus as your Lord and savior .(which I don't disagree with ) these things are not in scripture .But you do the same thing and say Scripture implies this . So please hold me to the same standard .
Ok lets start with the sinless Mary . Both Adam and Eve were created sinless so it is not an impossibility for him. Christ is the second Adam, Rom 5:14,and took the flesh from Mary .. The Ark of the Covenant carried the Word of God and Mary carried in her womb the Word of God in her flesh . Gabriel greet Mary by saying " Hail full of Grace , the Lord is with thee."which is a translation is Greek word Kecharitomene . On the other hand another greek word " full of grace" which was used for Christ in John 1:14 and stephen Acts 6:8 was the word Pleres Charitos. Scripture says she was "highly favored " which is the Greek work Charis .Charis is to be looked on as looked upon as favored but a transformation of this favor or Grace.Kecharitomene indicates perfection of Grace which indicates was in a state of sanctifying grace from the first moment of her conception .. The doctrine of the Immaculate Conception was by grace and privilege of God in view of the merits of Jesus Christ to preserve her from original sin .Mary did require a savior but by special intervention was preserved therefore redeemed by the Grace of Christ by anticipation . Mary called her self lowly Lk 1:48 which mean she was humble .This doctrine was defined by Pope Pius in 1854 .dogmas are defined formally when there is controversy that needs to be cleared up or when the Magisterium think the faithful can be helped by particular emphasis being drawn to some existing belief .
The Assumption is the fact that Mary did not die .We see in the OT Enoch " walked with God and he was seen no more" Gen 5:25 .He was translated so not to see death Heb 11:15. Then there was Elijah who was taken up to heaven in a fiery chariot 2 Kings 2:1-13. The Bible does not say what happened to Mary. Pope Pius exercise papal infallibility that after the completion of her earthly life was assumed body and soul into heave. You are correct that their is no scriptural proof .the possibility of a bodily assumption before the Second coming is referenced in 1 Cor 15:23 and Math 27:52-53.In the Early Church each Church would include the tombs of the apostles yet no Church claims her remains .
Mary as the mother of God is another issue .The early church there was a heresy of Nestorianism where the bishop Nestorian in 429 said that Mary was the Mother of Christ but not the Mother of God . Protestant shrink from the Catholic Statement that God was born of Mary . To acknowledge the Theotokos ( God bearer) is to believe in God the Son made man . Some evangelicals object to " Mother of God which honors Mary too much . It is easy for them to fall into Nestorianism who held that the union of the two natures of christ was little more a moral union of two distinct persons , the divine son and the human Jesus . Or as my friend put it Mary only gave birth to the human Jesus , but not acknowledging that Jesus was full human and fully God even at his conception . However scripture states ; Lk 1:43 "Elizabeth calls her the mother of my Lord" Mt 1:23 Vergin to bare a son="God is with us". Lk 1:35 The child will be called the holy,the Son of God Gal4:4 God sent his son ,born of a woman.
I will include scripture were saints and angels have been venerated or honored . Jos 5:14 Joshua fell prostrate before a angle, Dan 8:17 Daniel fell prostrate in terror before Gabriel , Tob 12:16 Tobit fell prostrate before a angel . It did not mean they were worshiping them . We honor Saints as examples to all of us and who are part of the body of Christ . While the Bible does not explicitly refer to the veneration and invocation of saints there there is scriptural warrant as I stated in scripture above .The veneration of Angles is predicated on their supernatural dignity , which comes from their union with God (Mt 18:10)Since the saints are also united with God( 1 Cor 13:12;1 John 3:2) it follows they are also worthy of veneration .The ancient Jews believed in the intercession of saints Judas Maccabaeus saw how 2 deceased men , the high priest Onias and the profit Jeremiah intercede with God for the Jews 2 Macc 15:11-16. And Jeremiah himself wrote that Moses and Samuel made intercession for the Jews after their deaths . We learn that the angels and saints place the prayers of the holy on earth at God's feet tob 12:12;Rev 5:8,8:3 . The verses also mean apparently that the angels and saints are the ones prayed to and they take these prays to God . Lazarus is seen in Abraham's bosom , Dives was asking him to intercede for him across the unbridgeable abyss then why should we not be able to pray to the Saints across an abyss they have successfully crossed over . Yes we can go to God ,but we can ask each other to pray for each other (interceed) and ask saints as well . I have a whole army behind me.We also have the early Church documents and the early Church fathers to support these practices .
The rosary is not in scripture and your issue would be that we engage in " vain repetition". Scripture shows Jesus repeating his pray 3 times Mat 26:39,42,44 . I Psalm 136 is repetitious . The "vain repetition" in scripture .was a a warning to pagans that their prayers vere vain because the gods they believed in did not exist.it is true that Jesus was warning us of mechanical ,mindless,repetitive prayer mantras , because they cheap imitations of from the heart prayers.He wasn't condemning the repetition of prayer all together . Jesus taught us to to pray the Our Father, but not the Our Father only . However there are many forms of prayer such as; the rosary, meditation , praying the psalms, open prayer.
Lastly I would like to deal with Mary's perpetual virginity , which Martin Luther , John calvin and Ulrich Zwingli believed in . Martin Luther said "When Matthew 1:25 says that Joseph did not know Mary carnally until she had brought forth a son, it does not follow that he knew her subsequently; on the contrary ,it means that he never did know her." Other scriptures include Lk 1:34 " How can this be I don't know man". Lk 2:41-51 age 12 jesus evidently the only son of Mary. In Mt 13:55-56 Brothers James, Joseph ,Simon and Jude, scripture shows that in mt 13:55-56 Mary the wife of Clopas is the mother of James and Joseph . In John 19:26 Mary is entrusted to John not a younger sibling as was the custom. Jn 7:3-4 it was not custom for younger brother to advise a elder brother .( they were cousins and in the Ariamic which Jesus spoke the word cousin was also referred to as Brothers and sisters ) In addition when I call you a brother that doesn't mean I am your biological brother as they called each other in scripture. Now referring to Mat 1:2" Joseph knew her not until she bore first born". John Calvin said " and besides this Our Lord Jesus Christ is called the fist born. This is not because there was a second or a third, but because the Gospel writer is praying regard to precedence." . You can google these Protestant reformers or the early Church Fathers regarding this subject, you will be surprised .