Allama Rahmatullah Hindi states in his book (Iz-har-ul-haqq):
Before the beginning of Islam there were no original copies of the Torah or the Bible left anywhere. The existing ones today are history books made up of true and false reports. The Torah and the Bible mentioned in Qur'an al-karim are not the existing books in the name of Torah and Bible. Of the teachings written in these books, the ones affirmed by Qur'an al-karim are true and those which it rejects are false.
All priests know that Isa (Jesus) 'alaihis-salam' did not write anything. He neither left behind any written documents nor had anyone write anything. He did not teach his Islam in written form. After his ascension to heaven, disagreements began among the Nazarenes. They could not come together to consolidate their religious knowledge. As a result, more than fifty Gospels were written. Four of them were chosen. Eight years after Isa 'alaihis-salam' the Gospel of Matthew was written in the Syrian language in Palestine. The orignial copy of this Gospel does not exist today. There is a book said to be its Greek version. The Gospel of Mark was written in Rome thirty years after him. The Gospel of Luke was written in Greek in Alexandria twenty-eight years after him. And thirty-eight years after him, the Gospel of John was written in Ephesus. All these Gospels contain narrations, stories, and events that happened after Isa 'alaihis-salam'. Luke and Mark are not among the Apostles. They wrote what they had heard from others. Authors of these Gospels did not call their books Injil (Bible). They said that theirs were history books. Those who called them the Bible were those who translated them afterwards.
THE SIRAT BRIDGE
When mentioning the Sirat  Bridge, we should not suppose that it is like bridges that we know. As a matter of fact, we say that it is necessary to pass the bridge of examination in order to pass the course. Every student will pass the bridge of examination. We call it a bridge because all students have to pass it. However, an examination is in no way similar to a bridge. There are those who can pass the bridge of examination, and there are also those who cannot pass it and fall down. But this is unlike falling down into the sea from a bridge. Only those who have passed the bridge of examination know how it is. Likewise, everybody will have to pass the Sirat Bridge, and others, being unable to pass, will fall down into Hell. But this bridge, passing it or falling down into Hell, is not like worldly bridges or the bridge of examination. It has no aspects resembling them.