I have not come across a single historian of any reputed university who is willing to look in to the tales of so called "Apostle Thomas" visit to India, Jesus in Gospels was a fundamentalist Jew and never once mingled with Non-Jews and called Children of True God as Dog and Pig. Jesus expected world to end in his life time; why would such a person's disciple visit a Country which believes in God and not biblical tales
I was researching on this topic recently. I highly recommend my small youtube video "Truth hidden from Christians (Nero, Apostle Peter and Apostle Paul in Rome, and Apostle Thomas in India).
Here is the link - https://www.youtube.com/watch?v=oye1C7_JJJE
I also recommend another youtube video of mine as well - https://www.youtube.com/watch?v=Vjc1Aa0a0rk&t=90s