What's the point of this life in Christianity?

[Esquilax]

I liked Milton's Paradise Lost...what's the value in being good if you can't test it....there is no good without a temptation of evil.

I guess that depends on whether you think good and evil are discrete, free floating concepts, or whether they're attached to physical actions and effects in reality. I tend to go for the latter, and in that case, good definitely exists without evil; you can perform a good, beneficial action in the absence of any possible evil, detrimental one. It's far fetched I know, but you could go your entire life without ever being able to perform an evil action, and still demonstrably do good, because the alternative to good isn't evil, it's neutral. There are three options there.