There is no disagreement that one of the conditions for its validity is Islam, as it is not valid for someone who is not a Muslim of Islam to submit to what the Truth has called you to, both outwardly and inwardly, in the manner in which He called you to be when answering. If you come with something other than that characteristic that He told you to do, then you will come with it. You did not answer the supplication of the Divine Name that called you, nor did you submit to it .