Why Do Muslim/Christian Convert Religion?

Religious conversion is the adoption of a set of beliefs identified with one particular religious denomination to the exclusion of others. Thus 'religious conversion' would describe the abandoning of adherence to one denomination and affiliating with another. This might be from one to another denomination within the same religion, for example, Christian Baptist to Methodist or Catholic, Muslim Shi'a to Sunni. In some cases, religious conversion "marks a transformation of religious identity and is symbolized by special rituals."

People convert to a different religion for various reasons, including: active conversion by free choice due to a change in beliefs, secondary conversion, deathbed conversion, conversion for convenience and marital conversion, and forced conversion such as conversion by violence or charity.

It's no more a new thing to see people say that they are converted or 'they were once a Muslim'. But, it's Odd to hear a Muslim talk about his ex Christianity life. The reason behind this phenomenon is contentious, capable of serious religious concern.

Is there a reason behind this? Share your opinions