I believe all religions and philosophies contain elements of universal truth, and I also believe their adherents should be treated with respect and tolerance. However, only the Roman Catholic Church contains the totality of all truth and is the one, true religion. Also, there's nothing wrong with believing yours is the one, true faith: Why would you be an adherent of it if you didn't?
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True happiness, joy, peace and love comes from having a personal relationship with God. You won't find it anywhere else no matter how hard you try to build it yourself with the ashes of worldly "pleasures" and desires.