Q&A: Can the devil bless someone?
Based on some Scriptures that quickly come to mind I would have to say, no, he cannot. That doesn't mean that Satan isn't able to serve up the fulfillment of some deep fleshly desire, but ultimately it isn't going to be a blessing — in fact, quite the opposite.
James makes it clear to us that...
Every good and perfect gift is from above, coming down from the Father of the heavenly lights, who does not change like shifting shadows. James 1:17 (NIV)
In other words, the blessings that come our way are from God, not Satan. Along those lines, the Apostle Paul reminded us that the works of Christ and the works of Satan have nothing in common. He wrote:
...what do righteousness and wickedness have in common? Or what fellowship can light have with darkness? What harmony is there between Christ and Belial? 2 Corinthians 6:14-15 (NIV)
And Jesus gave us some of the most insightful character references for Satan that we possess. The following passages are especially helpful in answering your question:
The thief comes only to steal and kill and destroy... John 10:10 (NIV)
[The devil] was a murderer from the beginning, not holding to the truth, for there is no truth in him. When he lies, he speaks his native language, for he is a liar and the father of lies. John 8:44 (NIV)
It seems pretty clear according to the Scripture that Satan is only capable of deception, lies, and murder.