[vladimir998]

You wrote:

“Could it be that many of his sailors were Jews.”

Unlikely since Columbus and the leaders of his expedition were committed to Christianity. Columbus believed he was specially chosen by God to bring the Gospel to the East.
Columbus’ Book of Prophecies is a study of the prophets of the Old Testament and the teaching of Christ about the duty to proclaim the Gospel to all nations. Columbus was a devout Catholic who attended Mass and received Holy Communion regularly. Columbus was a Third Order Franciscan who believed that the world should be converted to Christ.
Columbus’ journal in 1492, day after day, refers to Jesus and the need for divine help.

[muawiyah]

Columbus' first voyage's records have been plumbed to the depths ~ 12 Gypsies turned up.

Which may or may not be meaningful. These guys had entered Europe only a century before in Bulgaria.

[Uri’el-2012]

You forget !

Yah'shua was a Jew
ls a Jew and
will always be a Jew
and never a Roman catholic.

shalom b'SHEM Yah'shua HaMashiach

[ChicagoHebrew]

Columbus’ first officer was a Jew who wrote the ships logs using Hebrew characters. It’s a near certainty that there were many others.