I am not a scholar, but what could probably be the meaning is that one could in the search of truth learn different faiths.
This is applicable for people who are not Muslims.
For Muslims since they know that Islam is the truth they can still learn about the other faiths and appreciate the correctness and accuracy and wisdom of Quran, the only unchanged book on earth. People when reading the original text (unedited version) of other Abrahamic faiths definitely appreciate the word of god and the lessons contained within.
I know a lot of people who in pursuit of learning religions read each religious book and eventually stumbled upon Quran and became a Muslim. I study the bible myself and would definitely want to study the Torah some day. I understand this is an edited version but Islam commands you to be good to your neighbor and I wish to understand the person and their faith.
Hope this helps and Allah knows best.