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.

No. The souls in purgatory are not accessible to the devil or demons. They are safe in God’s hands, in what amounts to the “vestibule” of heaven. There, they undergo final purifications, which only lead to heaven (cf 1 Cor 3:13‐15). 
 
Further, at death, our final disposition for or against God; and for or against his Kingdom, is final, it is definitive. This places the souls in heaven, and also in purgatory beyond the reach of the devil. Sadly, it also places heaven beyond the reach of those who have finalized their decision against it. At death, the judgment or verdict is in and is irreversible. (see Luke 16:26; Heb 9:27; Jn 8:21; Jn 10:27‐28). 
 
We do well today to be more sober about this definitive aspect of death, and to realize that our cumulative decisions build toward a final disposition by us that God will, in the end, acknowledge.