I think that this falls into my area of expertise. I have a Masters in Theology (New Orleans Baptist Theological Seminary) and my thesis was on Faith Structures. Faith Structures is a way of performing religious archeology using the wire frame of specific beliefs to see what influences one faith may have had on another ... during the history of that faith.
Let's begin with an example, if you look at a house under construction, you can tell that it is a house as soon as the studs go up. There is a form that says "house", and if you walk through the structure at that point, you can even identify the function of the various rooms ... it doesn't take too much detective work to identify bedrooms, bathrooms, kitchens, etc.
In a similar manner, to get to the faith structure of any particular religion, you have to deconstruct the faith back down to the "bones". How do you know what is bone, and what is not? Easy. You start with the eliination of all dogma, and any faith aspect which can be traceable to an action of mankind. This eliminates all practices and ordinances arising from councils of clerics, pastors, priests, and theologians. Instead, the bones are considered to be only that which is handed down directly from diety (such as the ten commandments) or that which is considered to be unassailably divinely inspired. For those who follow canon rules, that spells trouble for both the book of Hebrews and the book of the Shepherd of Hermas (used in several religions in place of the book of Hebrews) ... since they both fail one of the five canon tests (for inclusion in the Bible).
Having explained that, and without diving too deeply into my thesis work, let me say that you can examine the faith structure of a religion in a manner similar to the study of DNA. You can see where one religion rubbed off on another, or which religion is an "ancestor" or "descendant" of some other religion. Case in point, when the Judeo faith was taken into Egypt (Jews in slavery, pre-Moses, remember?) the jews picked up on several religious practices that were used by the Egyptians. Hear me clearly ... they did not change the God they worshipped, and they did not add other gods. They changed the way they worshipped Jehovah (YHWH). Before Egypt, the Jews used worshp practices that centered around burnt offerings made by the family patriarch (See Abraham) at altars of stone on mountain tops (High Places). After Egypt, Moses (who was an Egyptian prince for a time) and Aaron institute the tabernacle, with inner and outer sanctums, and the creation of the holy of holies ... a place of actual residence of the presence of diety. These, and other embellishments are Egyptian practices which the Jews learned in Egypt ... and which were applied to worship Jehovah in a "better" manner.
So to my point. Wicca, as a specific representation of a faith, may trace back to Gerald Gardener ... but he got his faith structure from religions which were far older. There is truth in the saying that Christianity has Pagan DNA ... and that Wicca, as one of the new evolutions of pagan worship, does have a faith structure which pre-dates Christianity. In fact, many of the Wiccans of today are rejecting much of the Wiccan structure which was obvously crafted by Gardener (and later Alexander) to be self-serving or suspect. Many Pagans are returning to older and deeper practices that satisfies their souls in a way that Christianity cannot.
So, I would say that your claim of Wicca being a hoax, is false. And just for giggles ... the story of the son of god (half man, half god), born of a virgin, and who died as a sacrifice for our sins ... was used by 19 different and older religions before the Christians adopted the same "story". Funny enough, one of those earlier 19 faiths ... the Egyptians.
So, everyone has to make their own choice. As a rational adult with a theology degree, able to read Greek, Hebrew, etc. I chose to be a Pagan ... because that is what resonates best with my soul. You should do the same ... but remember to have tolerance for those who think differently from you. Diversity is a beautiful thing ... and in the afterlife we all hope for (most of us, anyway) ... we are all going to be together again ... call it Heaven, Nirvana, Summerland, et. al. ... as the Apostle Paul said ... "now we see but through a glass darkly." So let's leave it at that ... and leave any judgement up to the diety.
M.Th. and 27 years of practice and ministry.