My opinion about people who change of religion is the next.
I think that people who leave their religion to change of religion are people who know that their religion is not the truth. Therefore they will make researches about others religions and will find a religion who can satisfy them.
Why I think that ? I read messages in many Francophone forums about people who leaved Islam for Christianity and all these people discovered that Islam is not the truth. Likewise for people who leaved Christianity for Islam.
But we can note that all of them didn't analysed all main texts (holy book , commentaries by theologians , others texts who are the foundation of this religion etc...) about their new religion.
Also I can saw that many of them don't have the basic scientifical knowledge (Cosmology , Evolution theory , Gravity etc...)
What is your opinion about that ?