Why do people get initiated into a system they really do not believe in?

 I would not become a nun if I did not believe in the bible.

Why do people come to Isese and take on initiations and priestly titles if they do not believe in IFA and Orunmila and the Orisa as being THE supreme? You just don’t see Pastors not believing in the Bible as THE word. Or Jesus being their only savior. But yet time and time again I see people linking Ifa to Islam or Egypt and forget what our Word Odu says. Or not even giving IFA the reverence as being the Word to start and end all words. Please I need understanding so I can find tolerance.