Muslims should stand together along with other faith groups to rescue humanity from those who call for atheism, promiscuity, materialism, abortion, homosexuality, unisex marriages, bloodshed, and misappropriation of others’ property as well as those groups that enhance materialistic trends in man at the expense of his spiritual elevation.
The eminent Muslim scholar, Sheikh Muhammad Al-Hanooti, a member of the North American Fiqh Council, states:

Any action that could be helpful for enjoining what is good is encouraged and recommended. Likewise, the action that would prevent any evil or lessen it is also recommended. I urge every Muslim inevitably to participate in any movement or action to support righteousness and fight against these ugly, haram movements or homosexuality. This movement is a terrible regression to the era of the ancient history where people followed that style of life of a man interested in a man. When that nation was destroyed and obliterated as an example of the people who go against faith and ethics.

Shedding more light on the issue of cooperating with non-Muslims in fighting evil, the eminent Muslim scholar, Sheikh Yusuf Al-Qaradawi, adds:

Together we can stand to confront the enemies of religious faith and those who call for atheism, promiscuity, materialism, abortion, homosexuality, unisex marriages, bloodshed, misappropriation of others’ property, and enhancing materialistic trends in man at the expense of his spiritual elevation.
All of us need to stand together as one forum against those who want to ruin humankind by their calls and action and to reduce it from humanity to animalistic levels. Allah Almighty says: (Hast thou seen him who chooseth for his god his own lust? Wouldst thou then be guardian over him? Or deemest thou that most of them hear or understand? They are but as the cattle, nay, but they are farther astray!) (Al-Furqan 25: 43-33)
And we witnessed Al-Azhar and the World Muslim League come together with the Vatican to stand as one front during the conference on Population, held in Cairo, in 1994 and in the Women’s Conference in Beijing 1995 to oppose the non-religious sentiments, and the attempt of breaking the family ties, destabilizing the natural instincts that Allah Almighty has created to guide human beings to the straight path.