Allah (swt) created Adam on Friday. Adam entered paradise on Friday. He and his wife Eve landed on this planet earth on Friday. He died on Friday.
Friday is a blessing and a sacred day. The doors of Heaven are open of Friday while the doors of Hell are closed. Prayers and supplication (Du 'a') are accepted on Friday. The day of Friday is a day of Peace where all animals, birds and insects say "Peace" on that day.
Moreover, the Day of Judgment is to take place on Friday. Non-Muslims made their own decisions as to Saturday and Sunday. Allah (swt) sent Prophet Muhammad (pbuh) informing both the Christians and the Jews that they should take Friday as a holy and a sacred day. It is up to the individuals to do what they want. We do obey Allah (swt). He revealed a Surah in the Qur'an which has the name of Friday. Muslims are to summon and to congregate every Friday noon, and listen to the Khutbah (sermon) from the religious leader (Imam).
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