That said, Rome had trade with India when Julius Caesar was emperor and afterward.
If you follow the language, you can learn a lot of history.
There were ships from Aqaba that went to Goa via the strait of Djibouti, taking gold to India and returning with the expensive spice of the time, black pepper. When Thomas went to India, he did it via the Parthian Empire (i.e., Iraq and then Iran), but it would make sense that he would also have taken a ship from perhaps modern-day Abadan or Shahid Rajae to land in Goa rather than braving the Kush. Then afterward another one around the Indian peninsula to land on the east coast, where he was martyred.