If yes, why? And if no, why?

Do you think most people do or don't believe in those things?

There was a poll that asked this exact question:

Broken down by party, 32 percent of Democrats, 19 percent of independents and only 5 percent of Republicans said they are feminists.

But asked if they believe that "men and women should be social, political, and economic equals," 82 percent of the survey respondents said they did, and just 9 percent said they did not. Equal percentages of men and women said they agreed with that statement, along with 87 percent of Democrats, 81 percent of independents and 76 percent of Republicans.

http://www.huffingtonpost.com.au/entry/feminism-poll_n_3094917

The definition of feminism is: "the theory of the political, economic, and social equality of the sexes" but it seems most people fixate on the second meaning, which is "organized activity on behalf of women's rights and interests" (which is, activity carried out due to the belief that women are not yet equal to men in society)

https://www.merriam-webster.com/dictionary/feminism

Equality

Equal opportunity prevails when human beings effectively enjoy equal realms of possibility.

https://plato.stanford.edu/entries/equality/