I wholeheartedly reject that notion. You may think Jehovah can be manifested as Shiva; I do not. Jehovah's personality is different. What He says about Himself is contradicted by what I understand is believed about Shiva. So either Jehovah is right or Shiva is right. Not both. You may say it is possible to believe in contradicting realities, but I bet you still look in both directions before crossing a street.
"What He says about Himself is contradicted by what I understand is believed about Shiva. "
And tell me what is it that you know about Shiva is contradicted by Jehova? What makes you think that the two are mutually exclusive?