In dictionaries Default is identified as: a situation or condition that obtains in the absence of active intervention. There are a lot of examples to this default in Islam:
1- A creator: since we did not prove that existence can come from not existence we have to believe there is a creator.
2- One creator: since the laws of cosmos do not contradict with one another or change over time there is no good evidence to support more than one creator. Spiritually, humans have the inborn desire to worship one God and to live with him and by him. This relationship even gets stronger than our relationship with our family members.
3- The spiritual feeling and experience is too strong that is we can not disprove it and do not have the means to disprove it. If someone decided to astry from God with his mind and soul it does not prove to us that there is no human spirituality.
4- Humans are by default entitled to inhabitat heaven if they would submit to God's messages. Active denial, arrogance and resisting are against the inner cry of their souls to find God and in their inheritance of God's spirit to be righteous.
5- God's wrath is the default before he send most of his messengers. The wickedness of humans commonly preceded the coming of his messengers. Same with the second coming of Jesus. Thus when God send warning before his wrath we have to respect that and read the book of revelation.
6- The default at the day of judgment is no intercession to the disbelievers (variable according to situation compare one who believes the Quran is right in his heart and deny it with a devout Christian who red the Quran several times and honestly found it difficult to believe it is from God, the second I would think will deserve God's intercession "God's know better"), for sinners there is intercession but no guarantees.
