This is a question often asked, as Christianity is the "main" religion of the western world. I can only say the things I was taught and my personal experiences and hope that helps you find yourself. i was raised as a catholic and went to a convent school, and I felt close to the Gods in which ever way they manifest themselves always. I was just 13 when I made the conscious break with catholocism and saw it for what it was, a set of man made rules which had little to do with the worship and praise of God. I still have my communion cross, but that is more to do with the memory of my grandparents that gave it to me. The catholic practice of lighting candles comes from the way Celtic and Germanic tribes worshipped, as fire was sacred to them, and the christians had to make their relkigion acceptable to the people they were trying to convert.
As a general rule, Celtic worship is conducted outside, for it is the opinion of the ancient ones that the worship of the Gods cannot be conducted in any man made structure with a roof. Most modern day Celtic pagans worship outside whenever possible, but also have an altar, or candle corner for smaller devotions. it is advisable to always have something seasonal at the altars at home, like flowers, as that pleases the Gods. But devotions can be done at any time, even walking along and appreciating nature around you and giving thanks that you are a part of this beautiful world. Any gesture is appreciated. When conducting a ceremony, whether I am alone or leading the devotions in a group, I stretch my arms wide, upward towards the sky, to channel my energy and receive the blessings of the Gods. i can't tell you what is right or wrong, all I can tell you is how my family have celebrated their religion for centuries. I hope you find your way!
Peace, love and blessings, Michy

I don't use Christian images, but I love churches and their rituals, particularly of the "bells and smells" variety, being brought up high anglican. I never got the jesus thing and the dogma (the old welsh tales made more sense to me), but the associations with childhood spiritual awakening are very powerful and not to be dismissed.

Historically -- in ancient times, not just recent history -- many heathens in northern Europe included Christian images on their altars. They considered Jesus and Jehovah two among many gods. There are even archaeological finds that show jewelry makers were using the same die to case Thor's hammers and Christian crosses. Of course, there were some who objected to heathens adopting the Christian god. There is some thought, though, that when the heathens conquered Rome and took over the empire -- which was then one with the Christian church -- that they remade Christianity in their own image. So a good case could be made for heathens of today practicing both Christianity and heathenry.

"While I would say that my patron is St Kessog and that I also work with other saints, my shine is dedicated primarily to Cernunnos. When I first came across him, I was apprehensive. I was from a Christian background and found it difficult to get past the Lucifer image, but two events changed my mind..."

Donald McKinney writing about working with Gods and spirits in Walking th Mist