The dilemma of Book of Jasher

Christians being Christians keep playing the same tape. They ask questions which only backfires on them. Below is an example of such ignorance coming from Christians. They tend to cite the following verse without having the slight knowledge of what they read.

Those who follow the Messenger, the unlettered prophet, whom they find written in what they have of the Torah and the Gospel, who enjoins upon them what is right and forbids them what is wrong and makes lawful for them the good things and prohibits for them the evil and relieves them of their burden and the shackles which were upon them. So they who have believed in him, honored him, supported him and followed the light which was sent down with him - it is those who will be the successful. (Surah 7:157)

Notice how Christians try to add their own twist to the text. What they did to their scriptures, Christians are trying to do it on ours, but instead they fail. The verse says, Those who follow the apostle, the unlettered Prophet, whom they find mentioned in their own (scriptures) "whom they find written"  the Arabic word used is (maktūban written). The verse does not say you will find his "name" in the bible, rather written about him, i.e. description. Muslims throughout time have given multiple descriptions of Prophet Muhammed Pbuh from the Bible, which Christians and Jews reject. Again, Christians were chasing something which wasn't even mentioned, this shows how deluded these Christians are. So, before Christians jump on Muslims asking us to show the "name" of Prophet Muhammed Pbuh in the Bible, maybe they should first look for the saying of the Jesus which apparently was quoted from the Torah.

This is where it backfires on them. Since Christians love asking questions without knowledge, how do they explain this problem found in their bible.

And the sun stood still, and the moon stopped, until the nation took vengeance on their enemies. Is this not written in the Book of Jashar? The sun stopped in the midst of heaven and did not hurry to set for about a whole day. (Joshua 10:13)

 There is no Book of Jasher in the Bible. Why does the text direct us to a source which we no longer possess? There are only two ways to explain this, both unpalatable to modern fundamentalists. Either the Book of Jasher was a divinely inspired document, but it has been lost – which contradicts the Bible’s claim, in Psalms 12:6-7, that God will preserve his words forever – or it was not a divinely inspired document – which means that infallible scripture endorses as a reliable source a book that is neither infallible nor the word of God!

Talk about double standards. The fact you can't show us the Book of Jasher which pre-dates the Book of  Isaiah shows you guys have no ground to stand upon. Note: Isaiah is telling his readers this event of the sun standing still can be found in a book which was written prior to his. Let's turn the tables, if the original text Isaiah is referring to is not accessible how could you believe in what Isaiah wrote it true? This also shows Isaiah was using information from a source unknown to his people?

Now we are asking you where is the Book of Jasher, that we can verify Isaiah inspired by Yahweh was speaking or in this case writing the truth.

Do you see how asking questions on show us where puts Christians in a dilemma. See if you guys can hack that!