The 22-year-old, who worked as a sales assistant at Tesco in Brent Cross, also sent lewd photographs to the youngster and pleasured himself while talking to the teen.
However, Southwark Crown Court heard the schoolgirl had a history of exchanging explicit images with men on Facebook and had had her laptop confiscated by her mother before she started talking to Miah on her DS.
Miah retweeted several messages from Choudary including one just three days before his arrest on June 25 last year, which begins: ‘Which Muslim wouldn’t want to live in the Khilafah, ie Islamic ruling system…’.
However, Miah never met Choudary, merely following him on Twitter.
Today judge Nicholas Loraine-Smith sentenced Miah to 16 months in jail suspended for two years as well as a two year treatment programme.
He described him as an “immature” young man whose crime was a “one off”.
He said: “The prison sentence marks the seriousness of what you did. The course of treatment ensures it will not happen again and protects other young girls.
“The victim was just 15 and was young for her age, her mother said she was vulnerable and not streetwise.
“She had previously taken part in sexual chat with men online and her mother took away her Facebook access.
“She set up another Facebook account on her brother’s Nintendo DS under a false name and claimed to be living in LA.
“You had no sexual experience. You were feeling depressed and isolated, you were smoking cannabis.
“I accept you were immature for your age and once these conversations were finished you did not talk to other girls.”
The judge also praised Miah for being “helpful” to the police, who described him as a “different person” from the one who had committed the offences.
Miah, who has already signed the sex offenders register, was also made the subject of a sexual offences prevention order.
Mansoor Miah tried to book a hotel in Kent so he could have sex with a 15-year-old
I expect your body is hot
He was arrested after the child confessed to a schoolfriend, who then told a teacher. The school then informed the child’s mother who called a halt to the online contact with Miah and reported it to police.
Last month, Miah admitted attempting to meet a child following sexual grooming but he denied five further charges, which will lie on file.
Prosecutor Stephen Requena said the defendant first contacted his victim by Facebook on the afternoon of November 14, 2013.
After a four day gap he sent her increasingly explicit images while discussing arranging to meet her for sex in the Premier Inn in Folkestone, Kent.
Mr Requena added: “He first sends her messages about the Koran and Islam. She was someone sceptical.
“Having talked about Islam he proceeds to chat her up, having established her real age.
“He praises her physical appearance and asks if she has a boyfriend.”
He said Miah started by sending the victim a picture of his stomach muscles and asks him to “rate his abs”.
He then sends a picture exposing more of his stomach and his pubic hair and saying “do you want me to go lower”.
He then asks for a picture of her “hips” adding: “I expect your body is hot”.
Mr Requena said: “He then sent her a picture of his erect penis and exchanges somebody extremely dirty talk with her”.
When he was arrested Miah accepted he knew the girl was underage and admitted sending pictures to her. He also said he might have researched hotels on the internet.
In a statement, her mother described her daughter as “not very mature for her age, vulnerable, not streetwise, shy, not comfortable in social situations, which is why she talked to people on the Internet”.
She said it had greatly affected her daughter who had been really low and wanted to put it behind her.
Edward Jones, defending, described his client as a “confused young man” adding the girl had a history of sending explicit messages to men.
He added: “He [Miah] didn’t seek her out, he befriended her because she was a friend of a friend, not because she looks young, she looks 20.
“This was a young man confused about religious beliefs, smoking cannabis to significant degree. He has now sought to reform himself.
“He made a catastrophic error of judgement which he said would not be repeated.”