Lord, have mercy!
@NightOwl - would you think it okay to go see a dentist for a heart problem? After all, dentists are also doctors.
While I understand that Baptists seem to be "Christian" and closer to the Truth, however, I would support James' desire to see his parents go to the one true doctor and join Orthodoxy.
James, just keep praying and keep doing...and perhaps in time, with patience and love your parents will learn from you. Be the best example you can be!
May the Lord have mercy on everyone, open their hearts and minds to the truth and show them the true path to salvation.