First of all, this "guesstimate" is for the United States. Second, we have to be careful how we define "homophobia." A phobia is an irrational fear, so homophobia is an irrational fear of homosexuality. Some people don't like homosexuals because they haven't met one, or because someone has told them things that aren't true. So these people do not technically have homophobia.
Probably somewhere around 50% of people are ignorant or deceived about homosexuals. But I would guess that no more than one person out of five (20%) has an irrational fear of homosexuals.
A tiny fraction of adults are homophobic - irrationally afraid of homosexuals. Their homophobia has little effect on homosexuals or on themselves.
AARGH - Artists Against Rampant Government Homophobia - has 76 pages.
Discrimination is discrimination in any form.
Homophobia is in every country, but Israel does have one of the most gay-friendly cultures on the planet. Gay people would only find significant homophobia in Muslim and Christian villages, as well as ultra-Orthodox neighborhoods.
Education is good. But the best treatment for homophobia is personally knowing a gay person. That's why gay people should not disown homophobic friends.
Homophobia
It is called homophobia.
There is no such word as omophobia. Assuming that you mean homophobia, it is the dislike of homosexual people.
"Homophobia" is a song by Chumbawamba, released as part of their album "WYSIWYG" in 2000.
If fear of gays is homophobia, then fear of straight people would be heterophobia.
Sadly Homophobia exists in all countries on the planet.
It is called homophobic bullying or homophobia.