Sikhism says good things about Muslims.
Kabir, whose writings are in Sri Guru Granth Sahib, was a Muslim, Sufi Mystic. Whenever a Sikh goes to Gurdwara, they bow down in respect to Sri Guru Granth Sahib, and so in effect, they also bow down in respect to what Kabir spoke.
Additional Sufi saints whose writings are in Sri Guru Granth Sahib are; Bhagat Beni, Bhagat Bikhan, Baba Farid (Hazrat Baba Fariduddin Masud Ganjshakar), and Bhagat Sadhana. (Bhagat = Devotee)
Sikhism does mention good things about Muslims and Islam, as well as Hinduism.
ਸਹੰਸ ਨਾਮੁ ਲੈ ਲੈ ਕਰਉ ਸਲਾਮੁ ॥੩॥
I repeat the Naam, the Name of the Lord, a thousand times, and bow in reverence to Him. ||3||
ਕਹਤ ਕਬੀਰ ਰਾਮ ਗੁਨ ਗਾਵਉ ॥
Says Kabeer, I sing the Glorious Praises of the Lord;
ਹਿੰਦੂ ਤੁਰਕ ਦੋਊ ਸਮਝਾਵਉ ॥੪॥੪॥੧੩॥
I teach both Hindus and Muslims. ||4||4||13||
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ਅਲਹੁ ਗੈਬੁ ਸਗਲ ਘਟ ਭੀਤਰਿ ਹਿਰਦੈ ਲੇਹੁ ਬਿਚਾਰੀ ॥
Allah is hidden in every heart; reflect upon this in your mind.
ਹਿੰਦੂ ਤੁਰਕ ਦੁਹੂੰ ਮਹਿ ਏਕੈ ਕਹੈ ਕਬੀਰ ਪੁਕਾਰੀ ॥੩॥੭॥੨੯॥
The One Lord is within both Hindu and Muslim; Kabeer proclaims this out loud. ||3||7||29||
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ਬੇਦ ਕਤੇਬ ਕਹਹੁ ਮਤ ਝੂਠੇ ਝੂਠਾ ਜੋ ਨ ਬਿਚਾਰੈ ॥
Do not say that the Vedas, the Bible and the Koran are false. Those who do not contemplate them are false.
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How do Sikhs see Muslims? Truthfully, it depends. Ideally a Sikh should see a Muslim as his equal, but this is not always the case as in any religion.
If you were to visit a gurdwara, you would be given karah prasad, and given food in the langar (vegetarian food-hall) regardless of your sex, race, religion, riches, nationality or caste. All are welcome into a gurdwara, as long as they cover their head and remove their shoes.
It was a Muslim follower of Guru Arjan Dev ji who actually started the creation of the Golden Temple, if I recall correctly. Gursikh is far wiser than I, though, he will know more. :rainbow1: