How to get a divorce.

I have reached a point in my life that I can't live with my husband anymore. We are married since 12 years in a Latin Catholic rite as we both are from the same Latin Catholic religion. Since the marriage, he is not treating me as a wife but as a legally occupied object to do sex at anytime in the day and night. At first I thought it is a very normal thing in a husband wife relationship. So, i never objected his wish. But later on I started realising that that's not at all the right way of leading a good family life. He is working in abroad. And when he comes down on a vacation every year is always the start of my biggest nightmare ever. After marriage I was also with him in abroad till our baby boy turned 2years old. Though he is not forcefully trying for sex with me but is mentally and verbaly humiliating me to agree for sex. He watches porn a lot and also used to force me to watch it even if I ignore to watch. He needs sex 5-10 times a day. After doing all the house works and while I'm taking a little rest at night by sleeping he silently reaches on my private parts. When I object him or question him on his action he insults me by saying who and all are giving me sex that I don't let him have sex with me. And also calls me prostitute because of the same reason. For him sex is the first priority thing in a family life. I'm having sleepless nights with fights and arguments when he is with me. He made me hate sex the most in life that I don't want to do it ever again. But, he is not ready to understand me ever. He is very alcoholic also. Though he don't drink whole day and night, all most everyday he drinks. And when he drinks he drink till he get completely drunk. Doesn't matter if he is with his friends in a bar or in a public family function or something where they are serving alcohol drinks. Then when someone ask him about his habit of drinking too much he insults me by saying to them that I'm not at all giving him any peace of mind ever. (Actual fact is that he is a famous drinker in our area even before our wedding which I knew after the marriage.) And right then at home he torture me with his sexual desire and when I object he abuse me with such nasty words making me cry out loud, begging him to stop torturing me and let me live and to please consider me as a human being. Many times I even have warned him of and thought of committing suicide due to severe his tortures day and night. For him a wife is only a sex object for her husband. Right after that (if the fight happened is in day) or very next day (if the fight happened is at night) he calls up his parents and/or my parents and secretly tells them bad about me and make them scold me and as if I'm the only cause of making problems in the family. At one such situation when I have told to his parents about his tortures on me and suggested to take him for a deaddiction treatment, his mother shouted at me saying her son doesn't have any problem, So no treatmeant is required and I'm only trying to frame him as a mad person in front of others. He, his parents and my parents say that since I'm married to him and I'm living in his money, I should live my life completely serving and submitting to him with his wish only as per the holy Bible. My one sister adviced me to tolerate it until my child is grown up enough to support himself, and then if I want I can join the church to become a sister/mother there. My other sister adviced me that if I'm ready for another marriage after divorce then only think of divorce otherwise don't go for divorce, pray to god and he will hear your prayer. I'm not even thinking about any other marriage. I don't think I will need any man in my life again as I don't want to give it a chance. (I don't mean every man are same like my husband, but mentally I'm not feeling to have any man for me again.) He have a problem in me having any friends. Especially if it is a male then mix up me with that male and insulting in any arguments is a regular habit. This was not happened just with any one person but anyone who just give a smile to me and I give a smile back. According to him every men look at every women with only sex in mind. Because of his this behaviour though I was only having very few friends I completely stopped any contact with every friends of mine. According to him, I'm not doing any work at home but only sleep. Sweeping the house, mopping the house, cooking, washing the clothes, washing the dishes, teaching my child, etc., etc. are not any works at all? A person who don't even pick a glass of water and give to our child is saying that. I know he is working and earning the money. But, does that mean those I'm doing at home every day are not at all any work because I'm not earning any money? I have to wake up at 5am for my child's school and after he goes to school I try to sleep a little more. But, this sleep is also never possible when he is at home with me. After roaming here and there and after drinking he come home around 10:30-12 at night. I'm awake till then. After that when I go to bed then there after his tortures and all i might or might not get a chance to sleep for few hours or minutes. Yes, it is true when he is at his job in abroad; then I get to sleep and take rest in time as there is no much direct tortures. Ones one of his uncle (his father's brother who has political connection) told him right in front of me and his parents to just rape me if I'm not letting him have sex with me when ever he wish to. At that same time when I was completely getting humiliated by everyone I told about getting a divorce; that same uncle threatened me saying if I ever try to do so then he will make some proof proving I have extramarital affair and will frame me in it. My husband told that he will never give me a divorce. His parents said they will never let me get my child if in such case. He and his parents are very much addicted to big show offs in front of others. And because of that they lie alot to others. He have lied alot to me a many times about his job, health and all. Even the wedding was happened by lying his age. Though his actual age was 33yrs then, was told that he is only 30 which I came to know after the marriage. Here, I would like to know how to get a divorce from my husband as I'm completely unable to live with him anymore. I want my child to be with me. I'm a housewife. One side is that I'm scared of that uncle who had threatened me might spoil my whole life as he is a politician. Other side is we are Latin Christians and nobody in the family is supporting for a divorce as for them it is against and not permitted in our region. Our marriage was registered at the Church as Latin Catholic marriage and not in any government registration office. Your valuable and sincere advice would be a great help for me. Thank you.