The main mission of Watchmen on the Walls is in fact to pray for and support Israel but to the Left, their completely Biblical rejection of homosexuality is what defines them:
"An anti-gay religious group is planning a three-day conference beginning Friday at the Lynnwood Convention Center. Watchmen on the Walls expects as many as 700 people to attend the prayer gathering, including religious leaders and an anti-gay activist who claims the Holocaust was perpetrated by gays.
Convention center officials said there's little they can do to stop an organization from renting the publicly owned convention center. The venue is owned by the Lynnwood Public Facilities District, a public taxing district that operates the convention center but is separate from the city. "Our understanding is that they're law-abiding. They have a right of free speech just like any other group," said Mike Echelbarger, the board's chairman.
Snohomish County Executive Aaron Reardon said the group's anti-gay message isn't welcome.
Source
The "anti-gay activist who claims the Holocaust was perpetrated by gays" is Scott Lively. What Lively in fact does is point to very clear evidence of homosexuality in Hitler's Nazi party. You can read his claims for yourself here.
There is much support for Lively's thesis in conventional history. In addition to such well-known homosexuals as Roehm and Schirach at the top of the Nazi hierarchy there were others such as Heines -- whom Shirer ("The Rise and fall of the Third Reich") describes thus: "Edmund Heines, the Obergruppenfuehrer of Silesia... a notorious homosexual" (p. 307). Silesia is of course a major industrial area of great historic significance so command of the Nazis there was no mean post.
But Leftists avoid history like the plague, of course.