How Does Amadeus Give Me A Talent

In the film Amadeus, we can notice in many scenes that Wolfgang Amadeus Mozarts' personality is a bit humorous and giggly. Mozart acted like a child during his whole life. He always had a spending problem, he would use his earnings to buy alcohol and be with women. Wolfgang also loved to pull pranks on his friends, and, in short, have a good time. He loved fashion and dancing. Mozart also often burst into fits of anger if something upset him. For example, when speaking to higher ups, such as, Emperor Joesph the II, Rosenberg, etc. Mozart's attitude towards serious matter was always very open and out the box. Silieri's and many higher ups were sometimes questionable about giving Mozart new task because of his way of being. Although his language was at time vulgar, as he said in the film, we was a great musician and his music was nothing like his way of being.
Antonio Silieri's main point throughout the movie is - why did God give me a talent but then turn on me?
Antonio Salieri believes that Wolfgang Amadeus Mozarts' music is divine and miraculous. He wishes he was himself as good a musician as Mozart so that he can praise the Lord through composing. So one day he prays to God, asking Him to give Silieri the blessing of success and fame to make the Lords name well known and Silieri would make a pact with God to remains his and give God glory for his success and music. Following that scene, Antonio Silieris' father dies and he sees it as a sign or reward for his prayer. As he grows in success and is respected by the court composer of Austrian Emperor Joseph II and the Emperor himself, along comes Mozart and takes his place. He becomes shocked to learn that Mozart is such a vulgar person, and cannot underestand why God chose Mozart over himself. In the film Silieris' says speaks in the open and
says

"From now, we are enemies... You and I. Because You choose for Your instrument a boastful, lustful, smutty, infantile boy and give me for reward only to recognize the incarnation. Because You are unjust, unfair, unkind, I will block You, I swear it. I will hinder and harm Your creature as far as I am able. I will ruin Your incarnation"

"All I wanted was to sing to God. He gave me that longing... and then made me mute. Why? Tell me that. If He didn't want me to praise him with music, why implant the desire? Like a lust in my body! And then deny me the talent?",

then takes the flame out of candle with a cross. He is mad at God and is now going to seek revenge for what he thinks is Gods betrayl to him. He is jeleous but the film is mostly about him getting his revenge and position back. Showing God that he is greater than him. He gets Mozart to write his own mass by arriving at his residence dressed as the mask of death and bribes him with money in return for his work. Mozart not knowing what he was in for and who was under that mask, not his father...