BismilLaahir Rahmaanir Raheem.
Islam teaches us to be merciful to the entire creation, to Muslims and non-Muslims, to friends and enemies and even to the animals, trees, rocks etc. Mercy (Raḥmah) in Islam has a very wide meaning that includes kindness, compassion, love, tolerance, patience with people, and to treat others the way we would love to be treated. This Islamic value is at the core of the prophetic message and meaning of faith, just as it was in all of the revealed religions before Islam. Every Muslim needs to strive to be an agent of mercy on earth for all human beings and creatures.
Allah says to the nearest meaning:
وَمَا أَرْسَلْنَاكَ إِلَّا رَحْمَةً لِّلْعَالَمِينَ
I have not sent you except as mercy to the worlds. Suurat al-Anbiya 21:107. Which means mercy to everything on earth.
Allah intends for the mercy of Islam to touch every person on earth. It is not as some have claimed, that Islam is only merciful to Muslims. Rather, Islam teaches us to be mercy to the entire world and everyone in it.
Abdullah ibn Amr reported: The Messenger of Allah, peace and blessings be upon him, said:
Those who are merciful will be shown mercy by the Merciful. Be merciful to those on the earth and the One above the heavens will have mercy upon you. Source: Sunan al-Tirmidhī 1924. Our actions must be a source of daawah to non Muslims around us. We must strive to please Allah through our speech, our dress our treatment to others etc. If we treat especially non Muslims well whilst dressed well showing our identity as Muslims, that alone is enough daawah to them. To be continued in shaa Allaah. May Allah aid us to be merciful to others. Aameen.