Notice: Grammar problems are highlighted with red colour, and indicated with a number. Suggestion and corrections are given below the paragraphs.

东文化比西文化还好！ // This title is better: 东方文化比西方文化还好！东 / 西 means 'east/west' here, and they are adjective, however, in daily Chinese, like on the TV or newspaper, people uses '东方 / 西方' to indicate 'The Oriental / The  Westen'.

        在过去三十年里,(1)英国的美好的(2)文化很快地下降(3)。现在,(4)在英国,(5)很多人缺乏好的品行端正(6)。在最近几年,(7)我们看了(8)在年轻人当中迅速的日趋严重的(9)问题暴力，和十几岁的孕期(10)。英国人倾向于是很自私的人(11)，孩子们不再对大人尊重，不听(12)父母的话。很多青少年用毒品和酒喝太多了(13)！ 

//  1. A comma should be added here.
    2. To change '美好的' to the word '优秀', adjective, same meaning as '优秀的', which means good,outstanding,
    3. To change '很快地下降' to '快速衰退', which means to decline quickly.
    4. A comma should be added here.
    5. A comma should be added here.
    6. To change ' 好的品行端正' to '好的品行' or '端正的品行'.
    7. A comma should be added here.
    8. To change '看了' to '目睹了'.
    9. To change '迅速的日益严重的' to '迅速滋生的' or '日益严重的'.
    10. To change ‘十几岁的孕期' to '青少年早孕的社会问题', which means the social problem of the early pregnancy of teens.
     11. To change '英国人是倾向于很自私的人' to '英国人变得倾向于自私', which means The British changes to be inclined to selfishness.
     12. Be advised to change '不听' to '也不再听', which means they don't take parents' suggestions as well.
      13. To change '很多青少年用毒品和喝酒太多了!' to'很多青少年沉迷于毒品和酗酒！', which means many teens indulge in drugs and acohol.


        有人说这是电脑游戏，流行音乐和电影的错，我不同意，我觉得是父母的错。比起过去，现在父母和他们的孩子在一起花时间(14)越来越少。基督教的价值观念很久以前忘了(15)！ 

// 14. To change '花时间' to '所花的时间', which means the time they spent.
    15. To change '忘了' to '就被遗忘了！', which means the value of the Christian was forgotten already!


       我真的非常恨英国，不喜欢很多英国人。我真的希望有一天我能搬到另一个国家。 我想住在中国，韩国还是(16)日本。 东文化比西文化还好(17)！我非常比较喜欢东文化和亚洲人们(18)！

//  16. To change '还是' to '或者', which means 'or'. You should not use 还是 here, it means 'and'. Acutally, you want to choose a country, so you should say ' I want to live in China, Korean or Japan.'
     17. To change '东文化比西文化还好' to '东方的文化比西方文化要好', which means A is better than B. If it's as you wrote, you used 还好 here, then it means ' A is even better than B.' This is a different meaning here. If you used 要好, it means A is good, B is bad, so A is better than B. If you used  还好, then people will think that both A & B are good, but A is much better. Acutally, in your opinion, the oriental culutre is better than the westen, and the current culutre of the westen is bad.
     18. The last sentence, you want to say you like the oriental culture and asian people very much.  Be advised to change it to '我非常喜欢东方的文化和亚洲的人们！'  This is better to express your feeling exactly.


P.S. This is a good aritcle. You see many social problems of the modern British, and you have wished to live in Asian countries. However, asian countries have the same problems too, sometimes situations are ever worse. Maybe many British lost their faith in the Christian, this is really bad. But you know, in asian countries, like China, people believes in no religions, only a small scale of them believes in Buddhism. And nowaday, people in China, for example, are focusing on the way of how to become the rich, how to make higher entertainments, or how to gain some power. People, especial the youth, who just wants to spend more money of their parents', and be proud of having expensive cell phones, sports cars, famous brands of clothes, or many gfs/bfs. People has become selfish and cold to each other. Sometimes they lied to each other. So people lost confidence in each other. You see your social prolbems, and I see mine. It's hard to change somehow , but a possible way it to maintain our faith.

东文化比西文化还好！
东方文化比西方文化优越

在过去三十年里英国的美好的文化很快地下降。
在过去三十年里，英国的优秀文化传统日益消亡。
现在在英国很多人缺乏好的品行端正。在最近几年我们看了在年轻人当中迅速的日趋严重的问题暴力，和十几岁的孕期。
现在，很多英国人缺乏教养、品行不够端正。最近几年里，我们发现在年轻人群中暴力问题和少女早孕问题日趋严重。
英国人倾向于是很自私的人，孩子们不再对大人尊重，不听父母的话。很多青少年用毒品和酒喝太多了！
英国人正变得越来越自私，孩子们不再尊重长辈，不听父母的话。很多青少年滥用毒品和酗酒。
有人说这是电脑游戏，流行音乐和电影的错，我不同意，我觉得是父母的错。比起过去，现在父母和他们的孩子在一起花时间越来越少。基督教的价值观念很久以前忘了！
有人说这是由于年轻人过度沉溺于电脑游戏、流行音乐和电影造成的，但我不同意此观点。我认为这是父母的错。较之以往，现在的父母和孩子在一起的时间越来越少；而且从很久以前开始，基督教的价值观就被人们日渐遗忘。

我真的非常恨英国，不喜欢很多英国人。
我真的非常恨英国，觉得许多英国人很讨厌。
我真的希望有一天我能搬到另一个国家。 我想住在中国，韩国还是日本。 东文化比西文化还好！我非常比较喜欢东文化和亚洲人们！
我真的希望有一天自己可以搬到另一个国家居住。我想住在中国、韩国或者是日本。东方文化比西方文化优秀，相比之下，我真的更喜欢东方文化和亚洲人民！

东方文化比西文化还好！

在过去三十年里英国的美好文化在日趋下降。现在很多英国人缺乏好的品行。在最近几年我们看到在年轻人当中日趋严重的暴力事件，和十几岁的孕妇。英国人倾向自私，孩子们不再对大人尊重，不听父母的话。太多青少年嗜酒，吸毒！

有人说这是电脑游戏，流行音乐和电影的错，我不同意，我觉得是父母的错。比起过去，现在父母和他们的孩子呆在一起的时间越来越少。基督教的价值观念很久以前就忘了！

我真的非常恨英国，不喜欢很多英国人。我真的希望有一天我能搬到另一个国家。 我想住在中国，韩国或者日本。 东方文化比西文化好！我非常比较喜欢东方文化和亚洲人们！