There are images (icons and pictures) painted in the catacombs of Rome, many dated pretty reliably to the 2nd Century and a few which are very likely from the first Century, when the Christians met and had Mass in the Catacombs due to the persecution by the Romans when it was simply not possible to build a Church (it was against Roman laws at the time, outside of the Temple in Israel and a few pagan temple which still stood in Greece). They sure wouldn’t have been allowed to build a church for Christ in Rome itself! As to candles, have you ever read the story of the Maccabees? They used lamps with oil in them in the Temple, and even poor homes had a dish or two with oil in them and a wick for light. Wax candles just weren’t used then. That occurred later. Probably the earliest Churches to be built had lamps also. As the poster above stated, statues came later, when they were no longer so closely connected with the pagans. The Apostles were Jews, so of course, they wouldn’t carve a statue. They did have symbols though, – the fish was one of the first ‘symbols’ used by Christians. The Crucifix came later, after the Romans, basically. It would be the equivalent of having a representation of the electric chair to you. For the earliest believers, the Cross was an instrument of death and used by the Romans for executions. It took awhile before they began using the Cross as a symbol and longer before actual Crucifixes were carved.