Not at all impossible. 
What is impossible is what the church has done with Fatima. The church, in it's extremism has USED the good of Fatima to wage endless hate and war on EVERYONE!!! 
That is the problem and the end result of that approach is to alienate a great number of us who believe that the BVM, the mother of the prince of PAECE - that's PEACE!!! NOT war-death-kill and near total destruction of huge parts of this world. They who do these things are not done yet, there is more coming,. The hate never seems to end. 
The hate exploded under Pope John Paul II and consumed many in the lation nations. Now it has taken over the USA ever since JPII got elected pope. 
Truly, there are those who believe that the church is following the laws of God and the teachings of Christ when it kills - destroys and all for God. 
What does the phrase the prince mean. What does: shalt not bear false witness, not covet thy neighbors goods mean, not covet thy neighbors goods mean, not kill. NOT even OIL