Can a Protestant be devoted to Mary And the saints ?
Incidentally, in case it hasn't been made clear yet, of course Protestants can be devoted to Our Lady. It's not as though traditional Christians have a monopoly on that.
A Marian devotion doesn't somehow make somebody Catholic. I would argue you can't really be Catholic
without some level of devotion to Our Lady. But having a devotion to Our Lady doesn't make you Catholic. It does, however, put you in good company with the Church Fathers.
"The report concerning the child was noised abroad in Bethlehem. Some said, 'The Virgin Mary has given birth before she was married two months.' And many said, 'She has not given birth; the midwife has not gone up to her, and we heard no cries of pain'".
- Ascension of Isaiah 11 [AD 70]
"So the Virgin became a mother with great mercies. And she labored and bore the Son, but without pain, because it did not occur without purpose. And she did not seek a midwife, because he caused her to give life. She bore as a strong man, with will..."
- Odes of Solomon 19 [AD 80]
"Jesus became man by the Virgin so that the course which was taken by disobedience in the beginning through the agency of the serpent might be also the very course by which it would be put down. Eve, a virgin and undefiled, conceived the word of the serpent and bore disobedience and death. But the Virgin Mary received faith and joy when the angel Gabriel announced to her the glad tidings that the Spirit of the Lord would come upon her and the power of the Most High would overshadow her, for which reason the Holy One being born of her is the Son of God. And she replied 'Be it done unto me according to your word' [Luke 1:38]."
- Dialogue with Trypho the Jew 100 [AD 155]
There are other sources I could point to but these are some really early ones. And it's worth asking where did the Early Church get these ideas? Devotion to Our Lady was clearly a widespread practice. Two of these sources come from within the lifetime of at least a few apostles. Surely the apostles would've put a stop to it if a devotion to her was a grievous error.
And yet there's no indication the Church ever condemned Mariology. We can easily find evidence of the Early Church taking action against every conceivable heresy and schism you can imagine... but somehow they never get around to condemning Marian devotion?
That seems a little hard to believe.