Nope Poke Master
it aint!!

Participating in other religion's festivals isnt forbidden
But ye : believing in other religion's gods / goddeses is forbiddeen

Translation of Sura Al Kafirun from the Holy Qu'ran

• Say you, O infidels!
• I worship not that you worship.
• And nor you worship what I worship.
• And I shall not worship what you worshiped.
• And nor you shall worships what I worship.
• For you, your religion. and for me my religion