Change of Sect in Islam
Can a Muslim of one sect change to another Sect?
A Muhammadan male of female who has attained the age of puberty, may renounce the doctrines of the sect or sub-sect to which he or she belongs and adopt the tenets of the other sects or any other sub-sect, and he or she will thenceforth be subject to the law of the new sect of subs-sect.
It is important to be a Muslim and there is not restriction on changing of sect in Islam. One must fulfill the original requirements to be a Muslim while remaining in any sect. There are some sects which not fulfill the requirement of Muslim and conversion to such sect made one apostle hence the essential point in this question to retain the basic requirements of Muslim.
In your previous article we have discussed the Definition of Muslim, you can read it by clicking on the given link.