It’s only one truth that is achievable through all different religions is your own true SELF.( Only one Truth no second )
When human being came into existence their was no religion , who so ever learned his true nature form a religion or his followers.
All religions will always take you inside your own core . Through the path of devotion or through knowledge one can reach his core( true Self).
Once devotion or love grows to the optimal level or once knowledge get established through contemplation/practice then one leaps in his inner journey and get establish in his SELF.