Therefore it is wrong for a MUslim to pay no attention to his religious duties...

Therefore it is wrong for a MUslim to pay no attention to his religious duties, and to abandon them because he is expecting the Mahdi, the one who brings good tidings; because such an expectation must not induce us to have no responsibility or duty, or to postpone any of our actions, and it will not leave people aimless like animals. 32.

Doctrine of the Return (raj'ah) In this question the Shi'a follow what has been said by the Household of the Prophet: that Allah will cause people to return to this world in the same form as they were before; that He will distinguish between the righteous and the wrong-doers, and between the oppressed and the oppressors; and that this will take place during the time of Mahdi. Allah will not cause anyone to return unless he has attained a high degree of faith of has sunk deep into corruption.

After this they will die again, and on the Day of Resurrection they shall be raised again to be rewarded or punished, for Allah has mentioned in the Qur'an the desire of these people who have come twice into this world to come yet a third time in order to repent of their sins. They shall say:' 'Our Lord! Thou hast cause us to die two deaths, and Thou hast given us twice to live; now we confess our sins. Is there any way to go forth?

(40;11) Truly the Qur'an came to proclaim raj'ah in this world,as did many traditions from the house of Infallibility, and all the Imamites believe this, except a few who have interpreted the pronouncement on raj'ah as meaning that the government will return to the Household of the prophet together with the power to forbid and command, and that this will be when the Awaited One reappears, without involving the return of people or the giving of life to the dead.

Belief in raj'ah considered among the Sunni to be repugnant, and they deem it a heretical belief. Their collectors of ahadith considered one who had transmitted ahadith about raj'ah to be discredited, and caste of their transmission. Moreover, they considered one who believed in raj'ah to have descended to the ranks of unbelief (kufr) or polytheism (shirk) or worse. This belief was therefore one of the biggest cause for the despising of the Shi'a by the Sunni, and their slandering of them.

Undoubtedly, this was all part of the sabre-rattling engaged in by some Islamic sects in the past to damage each other and cause dissention.