Why is wicca so popular religion? any thoughts?
I personally believe it is because wicca do not threatened people with eternal hell and in wicca nature is very important . We modern people need to go out in the nature more than we do
I assume that by Wicca you are referring to the modern neo-pagan religion that Gerald Gardner developed in the mid-20th century. It is an earth religion, which practices magic (aka witchcraft) and believes in both the horned god, and the goddess, usually understood as being virgin, mother, and crone.
I think that the 20th century saw the rise of environmental consciousness in all religions to some degree. I remember the day when someone mentioned to me that they thought "dominion over the earth" meant stewardship, responsibility, not exploitation. I immediately adopted the word stewardship into my religious vocabulary.
Similarly, the general public became more understanding of other religions that expressly valued nature. Everyone began talking about the respect that Native Americans had for the earth, and many incorporated it into their private spirituality.
So yes, there may be some of this in why some choose to adopt Wicca.
I would like to suggest another reason, although its not a competition. There can be many reasons.
There is a certainly personality type that wants to be different and unusual. They seem to feel that only the unusual is special. They will adopt hairstyles, clothing, language, and habits that are off the beaten path. They also prefer to associate with groups that are outside the mainstream. It reminds me of Cindy Lauper's "She So Unusual."
That is exactly that sort of personality that will gravitate towards Wicca, simply because Wiccans are rare and marginalized by society.