What is the criterion for greeting with the salam one whom it is more likely than not is not a Muslim?

The Shaykh : Muhammad al-Sayyid asks: What is the criterion for the salam if the country contains both Muslims and non-Muslims? If a person passes by a man sitting at the time of prayer and it is more likely than not that he is not a Muslim, does he greet him with the salam? And is it said that greeting non-Muslims is one of the means of winning their hearts and inviting them to Islam? The majority in the country is considered. If the majority of this type of human being are Muslims, he greets him with the salam.
Unless the disbeliever is distinguished by a specific characteristic, in which case he greets the one who does not have that characteristic. Did you understand? As for the claim that if he greets them, it will win them over, this does not align with the saying of the Messenger (peace and blessings be upon him) This question is also from Fu'ad al-Juhani.