Why did the Greeks honor there gods?

The Classical Greeks honored their Gods with prayer, sacrifice, religious festivals, building sacred spaces (temples) as well as piety and good works in daily life.

Actually most religions use all or most of these things to honor their Gods.....

For more information on how the Greek Gods are STILL worshipped in the modern day (and yes there are modern worshippers of the Hellenic pantheon) you can check the websites below.....