According to one ‘hadith’, Islam will always remain on the rise; it will never fall a prey of downfall (DaraQutni; Behqui). Similarly our Nabi (saww) stated ‘ Islam always enhances; it is never reduced (Abu Daud; Hakim). It means Islam as a system-in all future times since its inception- is/will be followed by dominant/rising people. Let us analyze these ‘ahadith’ in the succeeding paras.
We have already seen in “Secret of Rise and Fall of Muslim Millat” that Allah has devised social laws for mankind which have been given only an option to adopt or not to adopt such social laws. If mankind adopts such social laws as enshrined in revealed knowledge, Allah generates positive social consequences; otherwise negative social consequences are unleashed by Allah. In other words, all social laws are as much natural laws as physical laws are: because these social laws are either recommended by Allah or are negative consequences generated under Allah’s social laws. It means mankind can avoid Allah’s recommendations as to social laws by their choice but they can’t escape the rule of social laws enforced by Allah. Therefore we can say social laws are also natural laws. As everything in nature exists in pair, social laws also exist in pairs like physical natural laws (for details plz see my article "social laws-existence in pairs). Every social law exists in positive as well as negative form; if social laws/system is in consonance with what is enshrined in revealed knowledge i.e. Quran and Sunnah, such social system exists in its positive form; otherwise, it exists in its negative form. In other words, regarding every social system, its positive form is paired with its negative form. Whenever we find a positive social system prevailing in any part of this world, we should be certain that paired negative form of that system also exists somewhere in this world. This is the way of nature which alternates positive social systems with negative ones among various nations. This is how rise and downfall of Muslims and non-Muslims is alternated. When Muslims' social systems are in consonance with revealed knowledge, they experience period of their rise as against the non-Muslims which experience their downfall during that period due to adoption of social systems repugnant to revealed knowledge. Similarly when non-Muslims' social systems become sufficiently consonant (not completely consonant) with revealed knowledge, they experience period of their rise as against the Muslims which experience their downfall during that period due to adoption of social systems repugnant to revealed knowledge.
Because non-Muslims only partially adopt (due to their disbelief in revealed knowledge) positive social systems, their period of rise is/will be always lesser (half of Muslims' period of rise) than that experienced by the Muslims. Adducing from one of the sayings of our Nabi (saw) we find that whenever Muslims' rise comes, it will always continue for one thousand years; whenever Muslims' downfall comes, it will continue for 500 years. This periodic rise and fall of Muslims will continue till the end of this world. Muslims' rise means Muslims start abridging/reducing the gap between the accumulative power of Muslim nations and that of the non-Muslim nations; this Muslims' rise ultimately leads the Muslims to dominate the non-Muslims. This Muslims' rise continues for 1000 years; after Muslims' domination is achieved, the power gap starts increasing in favor of the Muslims for the rest of rising years. After that Muslims' downfall begins, (which is actually non-Muslims' rise) which means non-Muslims start abridging/reducing the power gap between the non-Muslims and the Muslims. Non-Muslims' rise ultimately lead the non-Muslims to dominate the Muslims. This non-Muslims' rise continues for 500 years; after non-Muslims' domination is achieved, the power gap starts increasing in favor of the non-Muslims for the rest of the rising years. After that non-Muslims' downfall begins, which is actually rise of the Muslims for another 1000 years. It may be appreciated that during past 1500 years of rise and fall (570 AD-till date), Muslims remained dominant over non-Muslims for 1200 years (600+ AD - 1700+ AD), and non-Muslims are dominant over Muslims since last 300 years. It means 500 years of non-Muslims' rise does not necessarily mean 500 years domination over the Muslims.
From the foregoing it is clear that Islam as a system always remains on the rise. The Muslims may be on the downfall; the Muslims may be on the rise; non-Muslims may be on the rise; non-Muslims may be on the downfall. But, in all cases, it is Islamic systems which lead Muslims or non-Muslims to rise; it is Islamic systems whose principles and tenors are always made basis of most of the social institutions adopted by the rising Muslims or non-Muslims. Islamic principles and institutions have been/will be always adopted by dominant/rising people in all times to come. These facts testify above mentioned ‘ahadith’. (It may be noted there is difference between Eman and Islam; Eman is based on belief/faith and Islam is based on deeds).