“If Calvinism is anywhere near correct (an admission I emphatically do not make), then what is the impetus to evangelize the world?”
It has something to do with love the Lord your God and your neighbor. Since you don’t know who the elect are and since you know where salvation is, loving your neighbor is pointing him/her to the life saver. Jesus also tells us to do it and then says those that love Him do as He says. “Knowing therefore the terror of the Lord, we persuade men.............the love of Christ constrains us”.
What’s the point of pointing? If all has been predetermined, then so what?