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No, manifestation is not a sin. This question arises because some people misunderstand what manifestation is and think it is something that it is not.
Manifestation is simply the act of creating something through thought and action. Everyone manifests things every day, whether they realize it or not. For example, if you focus your thoughts on getting a new job, and then take action towards that goal, you are manifesting a new job.
There is nothing magical or mystical about manifestation – it is simply the law of attraction at work. Like attracts like, so whatever you focus on will be attracted to you.