Voodoo is witchcraft by the way... A form of it anyway.
Wicca is what we call new age relgion so is majority of what people practice today expecially when you consider druidry. I myself try to study the true orgins but its allot harder done then said. No relgion has full truth only pieces because we were never there in the past. We do not know all the truths however to many magick is true and I know I have seen it work. Magick is a force that is neither good and evil. It can be used by anyone who has the will and the belief but they also most beware that magick always back fire if not used properly. Its something only you can learn through studying it. However wicca is a baby version of what it once was and its also for idiot children who do not know what they are doing however there is many true practicners of that relgion as well.
No they won't.... I know I am a druid but many druids know that their ancient relgion been lost for years because thousands upon thousands of years ago druids did not have a written language. Anyway majority of pagan and christian relgions are connected. Pagans (mostly wiccans) have almost the exact morals of Christians and Christians have almost the exact holidays and sometimes cerimonial values. Its been like that since Christians came to Europe and tried to convert the druids.