The answer to this is going to be like treading on a minefield. I also ask you to read the question in this section, "Is being a Wiccan-Christian a contradiction?" Wiccans do not have a set dogma. We are a decentralized religion. As such, I can only give generalizations. MOST Wiccans believe in a Deity/Divinity. So do Christians. MOST Wiccans believe in an afterlife. So do most Christians. Both Wiccans and Christians have ideas about moral behavior. These ideas, however, vary considerably between Wicca and Christianity. Most Wiccans have a dying and resurrecting God theme, as does Christianity (Jesus). Both Wiccans and Christians have religious ceremonies and commune (pray) with the Divine. Christians celebrate Easter, and Wiccans celebrate Oestara (the meaning given to these holidays varies considerably from Wicca to Christianity). Wiccans and Christians both celebrate Yule/Christmas (the meaning given to the holiday is different, but similar when you consider the dying and resurrecting God theme). Both Wicca and Christianity have a sacred chalice, although the Christian usage varies. It is generally used in a communion if it is used. These are some of the general commonalities that can be found, although beliefs and practices vary widely in both Wicca and Christianity.

There's a really informative book that addresses both sides. It's called, " Pagans & Christians - The Personal Spiritual Experience" and is written by Gus DiZerega, Ph.D.

I haven't been practicing Wicca that long but the one rule I've heard from Wiccans and Christians is that you reap what you sow. Christians have alot of confusing doctrines. Christians and Wiccans also have simular concepts on the inner workings of man (the spirit of man) but seperate paths of salvation. Lot's of differences for instance: Christians are mono theologist and Wiccas are not...

i think this bumper sticker says it all

Well, Wiccans are Christian kids rebelling against their parents. and Christians are their parents.

Really..nothing. It is like what the Apostle Paul said at II Corinthians 6:15 -7:1 "Further, what harmony is there between Christ and Be′li·al? Or what portion does a faithful person have with an unbeliever? And what agreement does God’s temple have with idols? For we are a temple of a living God; just as God said: “I shall reside among them and walk among [them], and I shall be their God, and they will be my people.”  “‘Therefore get out from among them, and separate yourselves,’ says Jehovah, ‘and quit touching the unclean thing’”; “‘and I will take YOU in.’”  “‘And I shall be a father to YOU, and YOU will be sons and daughters to me,’ says Jehovah the Almighty.” -Therefore, since we have these promises, beloved ones, let us cleanse ourselves of every defilement of flesh and spirit, perfecting holiness in God’s fear.