Jesus said I am the WAY, the TRUTH and the LIFE, nobody can come onto the Father except by me (John 14:6).
This statement had been made centuries before Muhammad brought Islam. The statement was not to discredit islam because it had not existed then.




BUT Quran says:
"SHOW US THE STRAIGHT PATH,
THE PATH OF THOSE WHOM THOU HAST FAVOURED; Not the (path) of those who earn Thine anger nor of those who go astray". (Quran 1:6-7)

This forms part of Muslims' prayers five times daily.

"SHOW US THE STRAIGHT PATH "
Since God has shown mankind a way (path) to Himself through Jesus, why would He answer anybody's prayer seeking another way? This is the reason muslims from generations to generations have been praying for the straight path and never got it. If they have got it, they would have stopped praying for it five times every day, as you don't keep asking for what you have got. This shows they know that they are not on the "straight path" yet hence they continue praying for it. The question is: when are they going to be shown the straight path as many have died praying without getting the answer? What is the fate of those who have died without discovering the straight path?

"THE PATH OF THOSE WHOM THOU HAST FAVOURED"
This again implies that muslims have an idea that some people have been flavoured because they were shown the straight path to God. It means they that have not been shown the straight path are yet to be favoured. The question again is: when are they too going to be favoured as many have died years to years without favour as they were not shown the straight path before they died.

SOME OTHER REASONS WHY GOD WILL CONTINUE TO IGNORE MUSLIMS' PRAY FOR A STRAIGHT PATH

(1) Jesus said " And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come" (Mat. 24:14).
Here, Jesus made it categorically clear that it is the Gospel that would be preached till the end will come, he didn't say Islamic messages would come that would not recognize him as the Son of God and the Saviour of the world.

Also note that Jesus didn't make the statement in competition with Muhammad or Islam as both were yet to exist in Jesus time on earth.

(2) For other foundation can no man lay than that is laid, which is Jesus Christ (1 Corinthians 3:11). Founding of other religions that is not based on faith in Jesus is other foundation and such had been proscribed long before Muhammad brought islam. If the way is not Jesus way (path), God will not answer any prayer for another way.