An Evangelical Christian saw a holy card on my desk of the Blessed Mother. He was rather dismissive of it and my Catholic faith. I did not know how to answer him. He understands we don't worship her but still says we ought to focus only on Jesus.
In discussing such a matter with evangelical Protestants, it's best to stick with Scripture. While there are many scriptures we could quote, it seems the most fundamental passage to set the stage for the discussion is from the Gospel of Luke. There, Mary, under the influence of the Holy Spirit, and rejoicing with her cousin, Elizabeth, says, “From henceforth all generations shall call me blessed. For he that is mighty hath done to me great things; and holy is his name” (Luke 1:48-49 KJV)
Now, if the Word of God is inspired, and it is, then we should be asking a few questions of our own to good brothers and sisters in the evangelical tradition. Since Scripture says that all generations would call her blessed, aren’t we Catholics fulfilling exactly what Scripture says? And if we are thus fulfilling Scripture, how are you, and why do you criticize us for doing it?
It is not to the detriment of God to call Mary blessed, any more than it is a slight against an artist to praise a masterpiece by him. Mary is God's masterpiece, and as the text says, she is blessed because God who is mighty has done great things for her. In calling her blessed, we bless the artist, who is the Lord himself.
At some point, we need to start answering questions by asking a few of our own in a kind of Socratic method. And thus, a simple and humble question to ask our critical Evangelical brethren is "How do you fulfill what Scripture says of Mary, "all nations will call me blessed"? We should ask this with humility, but in silence, await and insist upon an answer.
"Building our Catholic faith one question at a time."