In case those who in the science of jurisprudence [ fiqh ]...
In case those who in the science of jurisprudence [ fiqh ] and scholastic theology [ kalam ] are technically called “downtrodden” [ musta‘af ] that is, mentally downtrodden abide by the truths they have found through their own intellects or through the teachings of a certain faith, they will receive the reward of their good deeds.
Of course, as to whether on the Day of Resurrection these people will be placed at the lowest level of heaven or in an intermediary world between heaven and hell, or the scene of trial on the Day of Resurrection will be held for this kind of people is another issue. At any rate, this group will not be subjected to the eternal punishment.
(3:85) This Qur'anic verse is explicit in stating that no religion other than Islam shall be accepted from the people. This is while your line of argument maintains that the other religions, more or less, will somehow be accepted also. How will you solve this problem? This verse has an exegesis-related discussion and if we lengthily embark on it here, we will drift away from the main discussion.
Nevertheless, the general point is that the religion sent down by God the Exalted to the people during the time of Ibrahim (Patriarch Abraham) was the religion of Islam and the people were obliged to act upon its commandments until such time that a new set of laws [ shari‘ah ] would be revealed.
When Prophet Moses was commissioned to the apostleship, the law of Abraham was abrogated, but the religion of Moses was the same religion of Islam with the only difference that some of its laws abrogated the pertinent ones in the shari‘ah of Abraham ( ‘a ).
The shari‘ah of Musa (Moses) was also abrogated with the coming of ‘Isa (Jesus) and the people were commissioned to act upon the new shari‘ah which was different from that of ‘Isa ( ‘a ), but the religion of ‘Isa ( ‘a ) was the same Islam (which is submission to God’s will).