I am reverted to Islam and was used to be a Hindu I do not worship idol but during some day in months Hindu worship the dead people of family to show them respect and for that they burn something like coal in name of them and prostate in front of them I am secretly following Islam and my mother told me to prostrate in front of that even I was a Muslim I just sit down and just took my head down I do not touch the ground with my nose and head and was taking name of Allah I can not say no to my parents for this have I done shirk I even cried after this in front of Allah and I am now feeling that I do not deserve to be a servant of Allah . what can I do now please help !! I can not ask for tauba as I can not promise to Allah that I will not do it again . help me
I'll mention some points (but it looks like this question goes beyond what random people on the Internet can help with):
If the object in question is not being ascribed any supernatural powers, we might view it as functioning as a sutrah. When praying with a sutrah, we are not worshiping the sutrah; we are worshiping Allah.
Sometimes it's better to do things that are not appropriate in Islam to foster better relations. Moreover, Islam encourages having good relationships with one's family members (e.g. Sahih al-Bukhari 5980).
There's a notion of not being obstinate in religious matters. Moreover, in extreme circumstances, Islam has a notion of taqiyya ("precautionary ... denial of religious belief"). However, determining whether this idea can be applied to these particular circumstances requires a scholar.
And Allah knows best.