basically, no.

there were repeated iranian invasions of greece over thousands of years from the area now called ukraine, where anachronistic buddhist statues have been found. the buddhist beliefs are, of course, of ultimate iranian origin in central asia, and not of indian origin in the south of the subcontinent. pythagoreanism was actually mostly derived from orphism, which was connected to the indigenous religions of the remnants of these iranian invasions in the areas around thrace and up the side of the black sea.

the similarities between greek and indian religion are consequently derived from the same common root of derivation as the similarities between greek and indian language - a common origin in the iranian tribes of central asia and southern russia.

http://www.youtube.com/watch?v=-F46QRtrQK4