There is only one God, which is beyond our ability to comprehend or understand. Therefore all religions are imperfect. To look at all and realise there is a core truth shared by all is the key.
I would say, to anyone who says 'My religion is the only true way' that they have missed the point and become attached to the path, rather than to travelling along the path to the goal at the end. It may be their one true way for them, but there are others for whom another path is equally the only one true way.
It is human nature that when we find something that we like and suits us, we tend to want to encourage others to share it.
If oyu look at each 'faith' there are many denominations within it, and many divisions within that. Within each Temple/Church etc there will be divisions again. Everyone actually has to create their own relationship with God/ the Divine/ the Absolute. Not just accepting what is presented to you from previous generations, or what is written in a book, is an important step.
I would say dont believe what others believe, find out what you can and cant believe. It should be an exploration, not an unquestioning belief in what someone else says we must believe