Ancient Helenism. Wiccans also worship Greek/Roman gods too.
Most Dianic Wiccans worship the Goddess only, acknowledging that She is the source of all living and contains all within Her.
They can. The Wicca religion does not mandate that you drop beliefs in other religions, so many Wiccans do worship Christ. Still, many others do not. Wiccans are accepting of others' beliefs and values, so you can be a Wiccan and still worship Christ.
Lucifer is a fallen angel found in the Abrahamic religions. Wiccans are a branch of Paganism. Pagans do not follow the Abrahamic teachings and do not even believe in the existence of Lucifer. Therefore, Wiccans do not worship Lucifer.
Buddhism does not worship any gods.
No, Wiccans worship the Earth Mother, a natural Goddess who has been worshipped since humans first evolved. Demons are evil - the Goddess is loving and good.
A sacred place can be anywhere, really, where one feels comfortable, in tune with nature and life in general, and can be alone (or alone with your group). Many Wiccans may practice inside a sacred circle, which is cast magically and is consecrated either with water or salt. As is common in most aspects of Wicca, there are differences between various Wiccans and various groups, so one sacred circle or sacred space may be entirely unique than any other.
Most modern people do not, not even Wiccans who most commonly worship the One, the Goddess, and the God acknowledge all of the ancient Greek deities.
yes
No there are not. Greek Gods are treated as mythology these days and not seen as something to worship to.
NO! wiccans do not worship Jesus. that's christians. we have our own goddess and god and believe that they are in nature therefore we worship nature.
yes the frigid god