Praise be to Allah.
The one who does not fast Ramadaan because he denies that it is obligatory is a kaafir and his prayer is not valid. The one who does not do it deliberately and out of carelessness is not a kaafir, according to the correct view, and his prayer is valid. The one who does not pay the obligatory zakaah because he denies that it is obligatory is a kaafir and his prayer is not valid. The one who does not do it deliberately and out of carelessness is not a kaafir and his prayer is valid. The same applies to Hajj; the one who does not do it because he denies that it is obligatory is a kaafir, but the one who does not do it although he is able to do it is not a kaafir and his prayer is valid.
Fataawa al-Lajnah al-Daa’imah li’l-Buhooth al-‘Ilmiyyah wa’l-Ifta (10/143, 144)
The one who does not pray is a kaafir and an apostate according to the correct scholarly view, so no act of worship that he does is valid.
See the answer to question no. 5208.
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