There is no problem in calling a non-Muslim by my brother's word.

exactly the contrary,

it's respectful and appreciated to calling a non-muslim by my brother's word or sir, etc..

and be friendly with him to give him a good picture of the Muslims.

that is what Allah Almighty ordered us to do.

Evidence of this in Surat ((17) Al-'Isra') Chapter number [17.53].

" Tell My worshipers, that they should say words that are the finest ".

In Arabic: (سورة الإسراء الآية رقم 53)

"وَقُلْ لِعِبَادِي يَقُولُوا الَّتِي هِيَ أَحْسَنُ"

But on the condition, that doesn't exceed the limits stipulated in Islam, between the girl and the non-mahram whether he is a Muslim or not.

summary

call non-muslim or Muslim by my brother's word it's just word to express the respect and appreciation. and don't cancel the sanctity(Hourma) between of the girl and non-mahram from men.

I hope my answer is clear.

There is no problem in calling a non-Muslim by my brother's word.

exactly the contrary,

it's respectful and appreciated to calling a non-muslim by my brother's word or sir, etc..

and be friendly with him to give him a good picture of the Muslims.

that is what Allah Almighty ordered us to do.

Evidence of this in Surat ((17) Al-'Isra') Chapter number [17.53].

" Tell My worshipers, that they should say words that are the finest ".

In Arabic: (سورة الإسراء الآية رقم 53)

"وَقُلْ لِعِبَادِي يَقُولُوا الَّتِي هِيَ أَحْسَنُ"

But on the condition, that doesn't exceed the limits stipulated in Islam, between the girl and the non-mahram whether he is a Muslim or not.

summary

call non-muslim or Muslim by my brother's word it's just word to express the respect and appreciation. and don't cancel the sanctity(Hourma) between of the girl and non-mahram from men.

I hope my answer is clear.

There is no problem in calling a non-Muslim by my brother's word.

exactly the contrary,

it's respectful and appreciated to calling a non-muslim by my brother's word or sir, etc..

and be friendly with him to give him a good picture of the Muslims.

that is what Allah Almighty ordered us to do.

Evidence of this in Surat (17 The Night Journey -Al-'Isra') Chapter number [17.53].

" Tell My worshipers, that they should say words that are the finest ".

In Arabic: (سورة الإسراء الآية رقم 53)

"وَقُلْ لِعِبَادِي يَقُولُوا الَّتِي هِيَ أَحْسَنُ"

But on the condition, that doesn't exceed the limits stipulated in Islam, between the girl and the non-mahram whether he is a Muslim or not.

summary

call non-muslim or Muslim by my brother's word it's just word to express the respect and appreciation. and don't cancel the sanctity(Hourma) between of the girl and non-mahram from men.

I hope my answer is clear.

There is no problem in calling a non-Muslim by my brother's word.

exactly the contrary,

it's respectful and appreciated to calling a non-muslim by my brother's word or sir, etc..

and be friendly with him to give him a good picture of the Muslims.

that is what Allah Almighty ordered us to do.

Evidence of this in Surat ((17) Al-'Isra') Chapter number [17.53].

" Tell My worshipers, that they should say words that are the finest ".

In Arabic: (سورة الإسراء الآية رقم 53)

"وَقُلْ لِعِبَادِي يَقُولُوا الَّتِي هِيَ أَحْسَنُ"

But on the condition, that doesn't exceed the limits stipulated in Islam, between the girl and the non-mahram whether he is a Muslim or not.

summary

call non-muslim or Muslim by my brother's word it's just word to express the respect and appreciation. and don't cancel the sanctity(Hourma) between of the girl and non-mahram from men.

I hope my answer is clear.