This is a very informative website about Lithuania.
http://www.everyculture.com/Ja-Ma/Lithuania.html

Here is a section about Etiquette and Religion:

Etiquette

Lithuanians are a reserved people with respect for tradition. They generally will not go out of their way to greet someone they do not know; people on public conveyances do not look directly at someone else unless they are friends and generally give up their seats to their elders.
People often bring a small gift of candy or flowers when they visit someone (always an odd number of flowers unless someone has passed away). Hosts are generous and do anything they can to make a guest comfortable.
Men always shake the hands of male friends when they meet in a café or on the street but never inside a door. This is one of many superstitions, which include not whistling indoors for fear of calling little devils and not sitting at the corner of a table if one wishes to marry soon.

Religion

Religious Beliefs. Lithuania is mainly Roman Catholic (90 percent), with some Lutherans and a few members of other churches. The Jewish population, was almost completely erased between 1941 and 1944.
Religious Practitioners. The Catholic Studies Academy has over eight hundred members in Lithuania, and there are several seminaries and monasteries. Klaipėda University has a Lutheran Evangelical Theology Center that hosts about thirty monks. The Lithuanian Lutheran Youth Center and various Bible studies organizations serve religious practitioners and their patrons.
Rituals and Holy Places. One of the most significant holy places is the Hill of Crosses just north of Šiauliai on the road to Rīga, Latvia. The hill has hundreds of thousands of crosses brought by believers from throughout the country and around the world. Although the Sovietsbulldozed the hill several times for its open violation of their anti-religious policy, the crosses always reappeared.

Read more: http://www.everyculture.com/Ja-Ma/Lithuania.html#ixzz3039MX2Cq