Bar none, Reagan's positives will outshine his negatives, whatever they may be in the eyes of many people with many different opinions.
He restored America's confidence in itself, an act that no other potential leader (democratic or republican) living could have done after JFK's death (except RFK).
He told the truth, telling the world the Soviet Union was an evil empire. If you read the "Fifty Year Wound" you'll learn about how the Soviets spent billions of dollars on elaborate cities in the 70's and 80's, preparing for a scenario where America would force them into a first strike.
He inspired hundreds of millions, gave hope to nearly as many, and made the right decisions in an era of American history (from Eisenhower on) where most of our leaders made poor ones.
He also moved the country firmly to the center, a good occurance, because now a good Democratic or Republican president is able to win majority support for a good idea, without having to jump all the way to the right or left to get it.
Was he perfect? No. Was he effective? Yes. Was he the greatest president? No. But he's in the top 6 in my book (Lincoln, Washington, Jefferson, FDR, Truman ahead of Reagan, Reagan is ahead of Teddy)
And one last thing. His religious faith, like that of Eisenhower, represents what is good about faith in the Republican party. Though both men approached their strong faiths from different angles and life situations, they should represent the twin pillars of faith in the Republican party, not the wackos at the 700 club and those who would enshrine hatred into the most important thing we've got, the Constitution.