Hi, you have some very good questions!
first, paganism is an umbrella term which covers a number of beliefs, including Wicca, but also including many more, such as shamanism and pantheism. You can google for a complete list of pagan related belief systems.
As to the gender imbalance, meaning you see far more women than men in paganism here on this forum... I don't know, quite frankly, I know lots of men on this forum who are proud and vocal pagans of various types.
I DO, however, know more Wiccans who are female than male. It doesn't mean they aren't around, but I think you may be right that there are more female than male Wiccans here. I have not heard of any information on this statistically.
About your last inquiry, as to whether men are intimidated by a goddess based belief system, since I am a woman, and I am a non-Wiccan Witch, and a pantheist, I can only say that I am reasonably certain that any male on this forum who is a pagan is almost assuredly NOT intimidated by female based spirituality. It is a basic part of paganism, which includes many images of gods AND goddesses. Sometimes these are taken literally, I think most of the time they are taken as symbolic, but paganism is very open to the various beliefs that its members have.
Interestingly, I do know Wiccans in the area where I live, the SF Bay Area, but most of them are indeed women. Not by a huge pecentage, and my small sampling could not be considered representative. Still, if such a gap exists in Wicca, I would be extremely surprised that the notion of being intimidated by the inclusion of the goddess would have anything to do with it.
Thanks for some very interesting questions!