It’s easy to disprove Christianity: Simply compare Matthew 16.28 with Acts 1.6-7.
“Verily I say unto you, There be some standing here, which shall not taste of death, till they see the Son of man coming in his kingdom.“
“When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel? And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power.”
Jesus did not re-establish the Kingdom as he prophesied he would which makes him a nevi sheker – a false prophet!