Isnt it that Muslims who do not obey Allah will remain in Hell for some days then they will Enter Paradise?
No it is not so. This is clear from this hadith: The Prophet; said, “The people of Paradise will enter Paradise, and the people of the (Hell) Fire will enter the (Hell) Fire: then a call-maker will get up (and make an announcement) among them, ‘O the people of the (Hell) Fire! No death anymore ! And O people of Paradise! No death (anymore) but Eternity.” – Sahih Bukhari Volume 8, Book 76, Number 552. No where are there any other hadiths or any verse in Quran, which say that Muslims will surely enter Jannah (paradise).