I'm an atheist,but spirituality scrambled my thoughts.

[Angrboda]

P1) Through spirituality, I [you] am able to find meaning in life;
P2) The spirituality is unlikely to be reasonable and is likely false;
C1) You are able to find meaning through something which is likely false and not real.

Taking C1:

P1) It is possible to find meaning through something that is likely not real;
P2) Things that aren't real cannot make life meaningful;
P3) You find life meaningful this way;
C2) Your finding meaning is likely caused by something that is not this spirituality.

Taking C2:
P1) You are finding meaning in life.
P2) This meaning likely comes from some other source than the spirituality.
C3a) You can find meaning in life from some other source.
C3b) The meaning you find comes from something other than the spirituality.
C3c) There are non-spiritual sources of meaning.

Taking C3c:
P1) Life can have meaning through non-spiritual sources;
P2) Nihilism posits that life has no meaning from non-spiritual, non-transcendant sources;
C4) Nihilism is not true.