Good one.. I can see where Calvinists would interpret that as saying that God gives people the "gift to believe". But I believe it is wrong to interpret that one verse in that way when there are many other scriptures contradicting that understanding.
Calvinists will disagree, but I believe that since the Bible is clear that God wants all men to be saved (1 Tim 2:4), He is not willing that any should perish (2 Pet 3:9), that the "gift" in that verse is not the "gift to believe", but along with the fact that Christians choose TO believe, God has given us to suffer for Him. Standing for Christ is not always easy.
The debate over whether Calvinism is true or not will not be settled here. People have been arguing about it for centuries. But I remain absolutely convinced that Calvinism is not true, that God gave people the ability to choose. He wants people to choose Him, He does not make some love Him but not others. That's not love.