Here’s a beautiful test found in 1 John 4:1,2

1Jo 4:1 ¶ Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
1Jo 4:2 Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:
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Apply this test on what came in the Holy Qur’an.
بسم الله الرحمن الرحيم
إِذْ قَالَتِ الْمَلآئِكَةُ يَا مَرْيَمُ إِنَّ اللّهَ يُبَشِّرُكِ بِكَلِمَةٍ مِّنْهُ اسْمُهُ الْمَسِيحُ عِيسَى ابْنُ مَرْيَمَ وَجِيهاً فِي الدُّنْيَا وَالآخِرَةِ وَمِنَ الْمُقَرَّبِينَ [آل عمران : 45]

In the Name of Allah, Most Gracious, Most Merciful
Behold the angels said: O Mary God giveth thee glad tidings of a word from him: his name will be Christ Jesus, the son of Mary, held in honor in this world and the hereafter and of (the company of) those nearest to God;

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so why don’t you apply this test on Islam and the prophet Muhammad pbuh?????