If we are all suppose to maintain whatever religion our parents taught us, then no one should convert from it to any other religion. But no one really believes this. Hindus accept converts from other religions just as Muslims do. As a matter of fact, people are changing religions all the time. We personally know Muslims who became Christians, Christians who became Jews, Hindus who became Buddhists, etc.
Some people go from one religion to another as easily as they change cars.
People can and do change their religion. This is simply a fact of life that we must all deal with. Our own children may leave our religion and convert to another religion. It happens all the time. Only a fool would deny this.