What does Sikhism say about other religions?

Respected Michelle Mone ji,
Waheguru ji ka Khalsa, Waheguru ji ki Fateh!

In response to your question, the undersigned wants to say that there doesn’t seem to be any clear reference to Christianity in Guru Granth Sahib. One common word Kateb or Kateban appears many times. Prof. Sahib Singh ji gives its meanings as four holy books of Christianity and Islam namely ‘ Qur’an, Injil, Torah and Zabur. Some examples from Shabads in Guru Granth Sahib are given below for your knowledge.

At Panna 1021-22 of Guru Granth Sahib, in the following stanza, Guru Sahib is guiding us that neither Vedas etc., the religious books of Hinduism, nor the religious books of western religions (Christianity and Islam etc.) have deeply understood the entity of God (Akalpurakh in Sikhism):-

The Vedas and the Bible do not know the mystery of God. He has no mother, father, child or brother.
He created all the mountains, and levels them again; the Unseen Lord cannot be seen. || 6 ||

Further, Bhagat Kabir ji, guides at Panna 1349 of Guru Granth Sahib as under:-

PRABHAATEE: If the Lord Allah lives only in the mosque, then to whom does the rest of the world belong? According to the Hindus, the Lord’s Name abides in the idol, but there is no truth in either of these claims. || 1 || O Allah, O Raam, I live by Your Name. Please show mercy to me, O Master. || 1 || Pause || The God of the Hindus lives in the southern lands, and the God of the Muslims lives in the west. So search in your heart — look deep into your heart of hearts; this is the home and the place where God lives. || 2 || The Brahmins observe twenty-four fasts during the year, and the Muslims fast during the month of Ramadaan. The Muslims set aside eleven months, and claim that the treasure is only in the one month. || 3 || What is the use of bathing at Orissa? Why do the Muslims bow their heads in the mosque? If someone has deception in his heart, what good is it for him to utter prayers? And what good is it for him to go on pilgrimage to Mecca? || 4 || You fashioned all these men and women, Lord. All these are Your Forms. Kabeer is the child of God, Allah, Raam. All the Gurus and prophets are mine. || 5 || Says Kabeer, listen, O men and women: seek the Sanctuary of the One. Chant the Naam, the Name of the Lord, O mortals, and you shall surely be carried across. || 6 || 2 ||

The most distinct teaching of Guru Granth Sahib is that it teaches about spiritual emancipation/ salvation in this life itself whereas no other religion teaches so.

Guru Granth Sahib doesn’t accept the existence of heaven and hell whereas it is not so in case of other religions.

Guru Granth Sahib doesn’t accept reincarnation (Both previous and after life) and teaches the Sikh to live the present life in such a way so as to become one with Akalpurakh and Shabad Guru, who are embodiment of each other, and reach the stage of spiritual equipoise and spiritual bliss and finally achieve spiritual emancipation/salvation in this life itself.

Guru Granth Sahib doesn’t not tell unbelievable stories, which is not so in the case of Bible and Qur’an. The Guru Granth Sahib teaches only and only spirituality.

Hope it helps. If you have any further questions, please do ask. If you find any deficiencies, please point out the same, for improvement in future.

Regards,
Your Brother
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The scriptures say that there are 18,000 worlds, but in reality, there is only One Universe. If you try to write an account of this, you will surely finish yourself before you finish writing it. O Nanak, call Him Great! He Himself knows Himself. || 22 || (Panna 5)
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The Vedas and the Scriptures are only make-believe, O Siblings of Destiny; they do not relieve the anxiety of the heart. If you
will only center yourself on the Lord, even for just a breath, then you shall see the Lord face-to-face, present before you. || 1
|| (Panna 727)
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PAUREE: The followers of the Vedas, the Bible and the Koran, standing at Your Door, meditate on You. Uncounted are those who fall at Your Door. Brahma meditates on You, as does Indra on his throne. Shiva and Vishnu, and their incarnations, chant the Lord’s Praise with their mouths, as do the Pirs, the spiritual teachers, the prophets and the Shaykhs, the silent sages and the seers. Through and through, the Formless Lord is woven into each and every heart. One is destroyed through falsehood; through righteousness, one prospers. Whatever the Lord links him to, to that he is linked. || 2 || {Panna 518}