As-Salam aleikum wa rahmatullahi wa baraketuh,
I was also surprised when I’ve read this article denying the Miraj of Prophet Mohammed (pbuh). I confirm of what brother fadi quotes from the Quran, and even in authentic sunna you can find hadiths relating the moment of ascension of Prophet Mohammed (pbuh) who - by passing through all seven heavens - saw in his way prophets like Adam (pbuh), Jesus and John the Baptist (pb upon them), Noe (pbuh), Idris (pbuh), Moses (pbuh) and Abraham (pbuh). So, the ascension of Prophet Mohammed (pbuh) indeed took place, there is no doubt of that.
Also, remember my post about the White Horse from the Book of Revelation ? This description clearly shows that the rider was in heaven, and to be honest, we don’t recognize anyone who could fits this person from Revelation besides Prophet Mohammed (pbuh). Allah knows best!
It would be better brother Osama to correct your statement on that particular issue. As a Muslims, we should correct each other
Take care, and salam
Ahmed (Poland, Warsaw)