. Yes, there are St Andrew's churches in many places, but few that can claim to have been founded by St Andrew himself, where he preached in the mid first century.
I heard the same story about Peter, in that he didn't feel worthy to be crucified in like manner as Jesus was, and was martyred in Rome.
What we have is tradition and a 2nd century apocryphal stating such, but he could very well have been crucified in that manner..
Frankly, I have my doubts that Peter ever made it to Rome, and I am not alone.
That is why when I posted about Andrew, I specifically noted that..the story was no cannon, but by tradition and historians.