You are repeating your question:
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We, Muslims, simply do not have the authority to call anyone a kafir:
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Unless they declare themselves as a kafir:
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Declaring someone kafir without them saying so, is something only Allah does. He tells you not to challenge this authority of His:
O you who have believed, when you go forth in the cause of Allah , investigate; and do not say to one who gives you a greeting of peace “You are not a believer,” aspiring for the goods of worldly life; for with Allah are many acquisitions. You were like that before yourself; then Allah conferred His favor upon you, so investigate. Indeed Allah is ever, with what you do, Acquainted. (Qur’an 4:94)
…So do not claim yourselves to be pure; He is most knowing of who truly fears Him. (Qur’an 53:32)