Making a hand gesture that is similar to eating is actually considered very rude and offensive.
Warm hugs are a typical way of greeting.
Italians tend to stand closer, uncomfortably close for some people, when conversing with you, with very direct eye contact and frequent interruptions.
Culture is a popular conversation topic.
Dining can take hours, and although punctuality is not a must, it still looks good to be on time.
Do not reciprocate with a gift unless one is given to you first. Avoid giving gifts with company logos.
Relationships are very important, even in business.
When presenting in a professional setting, make sure all presentations and handouts are visually appealing.
There tends to be respect with age and power.
Expressing disagreements is common in order to create constructive conflict.

https://www.cia.gov/library/publications/the-world-factbook/geos/it.html (Majority of information)
http://www.istat.it/it/archivio/149003 (Ethnic data)
http://www.istat.it/it/archivio/129854 (Ethnic data)
http://www.pewforum.org/files/2014/01/global-religion-full.pdf (Religious data)
http://www.istat.it/en/archive/dataset (City population data)
Wolfram|Alpha (Currency exchange data)
Information accurate to best of ability as of 9 November 2016