The man came to Christ by faith. Result: Sins forgiven and washed away, granted eternal life, adopted into God's family as a son, declared righteous, will reign over the earth with Christ when he returns. So what?
Also, it helps affirm our long and deep heritage as a Christian Nation. If he had declared himself a Muslim or an atheist, I suppose you would be promoting it also. :)
Arrested in chains and then vindicated and commissioned to do a forth voyage. His punishment of the offenders was justified. The Taino people were largely wiped out by disease. Slavery was the common practice of the day, especially among the indigenous people of the region. The Spanish were no saints and neither were the natives.