Well, an Amish-style quilt would be as relevant or appropriate as giving one to your Catholic or Jewish or Sikh doctor.
Meaning, unless they have some knowledge of the style, it will just be a pattern.
If you're trying to make a nice quilt as a gift and that's the style you've chosen, then fine.
If you're
trying to make a religious connection, um, there isn't one.
If you want to make a quilt that intentionally has a religious connection, you could make him the equivalent of a cross wall hanging, which would be the crescent and star symbols.
Since he's a cardiologist, doing something with hearts would not be out of place, or in this case, kitschy.
Or making one with the symbol for MD
http://www.carstickers.com/proddetail.php?prod=3060
I'm in the process of making a quilt for my mother's former aide, who took loving, devoted and compassionate care of her for a couple of years, for which I will be forever grateful
But because of her background, and I didn't want to do something in-you-face religious-wise, I decided to reference some of the famous complex Islamic tiling patterns found in her native country of Morocco.
It's a queen-size quilt.
Luckily, she's only 23, and like a little sister, so I have plenty of time to work this out.
But your doctor could be Swedish for all I know so that wouldn't work. ;-)
If he were Catholic or Baptist or Methodist, would you feel comfortable giving him a cross quilt?
Then make one with the star and crescent
http://www.religionfacts.com/islam/symbols.htm
Or go with the MD symbol.
Or just make some nice stars in nice colors, writing on the label how grateful you are for his care.
Personally, I think I'd go with the MD symbol.
I don't like to get into other people's religious life, even when it's my own.
You can really jazz it up with colors, great fabrics, quilting, etc. and not make it so clinical.
Nice and compact at ~24" square.
And done.
This would be something that can easily hang in his office, and it's still very relevant and personal.