It’s a good question. Thank you for asking. It is good to try to understand others.
I converted to Catholicism after 47 years of evangelical Protestantism. The denominations that I was part of included Conference Baptist, Southern Baptist, Christian church, Christian and Missionary Alliance, Assemblies of God, and the Evangelical Free Church in America. These are all “evangelical” denominations.
When I was growing up, evangelicals would have condemned the sacramentals as unnecessary. You see, evangelicals believe that tangible “things” are not of use in knowing God. God is spirit, and those who worship Him worship in spirit and truth.
Yes, I know, it’s a heresy. But at that time, I didn’t know that. It just made sense to me that this world and our bodies are not significant, while the soul and the world that we cannot see are significant. This teaching helped us to bear physical suffering, as we knew that our bodies would pass, but our souls would live forever.
But that was 40 years ago.
In recent years, there has been an increase of interest among evangelicals in sacramentals. So many evangelical churches are plain and frankly ugly. Many evangelicals meet in gymnasiums or old retail stores, and these Christians are starved for beauty. So when they see beautiful icons, stained glass windows, etc., they respond emotionally and enjoy the experience. I think a lot of evangelicals enjoy visiting Catholic churches, as well as old Protestant churches, because they are so beautiful.
I think that the “emergent church” movement has helped educate many evangelicals that the sacramentals are part of Christian tradition and helpful for keeping our faith centered on Jesus.
After all, even evangelicals wear cross necklaces, and their children make Good News bracelets!
The statues and images are different, though. There are some very influential evangelical denominations that do not believe in making ANY images of Jesus, including pictures in Sunday school books. J.I. Packer is a respected and beloved evangelical teacher and author who teaches this point of view.
And even evangelicals who allow pictures of Jesus usually do not allow statues of Jesus or other Biblical figures. They are very uncomfortable with “graven images.” I think many evangelicals would not feel comfortable with the statuary because they think it might be idolatrous. If they see someone kneeling in front of a statue or picture, this would make them feel that the person is worshiping a graven image, which is a practice that the Bible condemns.
Yes, I know, the Catholic is not worshiping the image. I’m only telling you how the evangelical Protestant FEELS. That’s the OP’s question after all.
As for statues of the Catholic saints, I think it is safe to say that other than St. Valentine, St. Patrick, St. Nicholas, and St. Francis (because of pet cemeteries), most evangelicals have no idea who any of the Catholic saints are and have never heard their names mentioned. Honest, before I started attending a Catholic church, I had never heard of St. Teresa of Avila, St. Anthony of Padua, or most of the saints. I had two Catholic elementary school reading textbooks from the old country schools, and these textbooks contained the stories of St. Catherine (of Siena), St. John Bosco, St. Stanislaus, St. Brigid, and St. Rose of Lima. It was funny to Catholics that I knew these stories in detail, but had never heard of so many of the other saints!
I want to mention that the fundamentalist Protestant denominations will utterly condemn all sacramental as idolatrous. However, it is unlikely that any of the Christians from these denominations will “mix” with Catholics, as most fundamentalists practice “separatism.” They don’t even mix with other Protestants!
Mainline Protestants (Lutheran, Episcopal, Presbyterian, Reformed, United Church of Christ, United Methodists, etc.) will generally have no problem with sacramentals. Indeed, praying with beads has become a “fad” in some of these denominations. In fact, even some evangelicals pray with beads. My husband became interested in the “ecumenical Rosary” long before we even thought about visiting Catholic churches, and he started studying the Rosary and making beautiful Rosaries. Eventually he became convinced of the value of the Catholic Rosary. Our diocescan newspaper actually did an article about him, the Protestant who makes Rosaries! It got us in trouble with our EFree Church, as they are one of the denominations that tends to condemn sacramentals as “idolatrous.”
I hope this information is helpful to the OP and others.