Dominic-
If the Third Secret of Fatima really states that Mary is God then where exactly in that document does it say this?
And if this is truly a teaching of the Roman Catholic Church then it must be a very basic and important dogma for all the faithful to know. Now if the Fatima visions are supposed to have occurred in 1917 then why is there no mention of this revelation of Mary being God in the Catechism of the Catholic Church which was published in 1992 and meant to be an exhaustive summary of all the teachings of the Roman Church?
Have any of your Popes declared it to be a dogma?
It sounds as if either you have misunderstood the teachings of your church or you are a member of some schismatic group within/outside of it..........
If you want to be a Roman Catholic then stick to your Catechism; if you want to follow your own interpretation of things then become a Protestant; and if you want to belong to the Church of the Apostles then come home to the Holy Orthodox Catholic Church to which we belong.
God Bless You,
David