The kingdom of the Father can only take place once Jesus delivers up the kingdom to the Father in 1 Corinthians 15:24.
If the kingdom of heaven is the kingdom of the Father then how do you explain Matthew 11:12?
Matthew 11:12 And from the days of John the Baptist until now the kingdom of heaven suffereth violence, and the violent take it by force.
How can that be the case? The heavenly kingdom of God was already established in Daniel 2 in Daniel's lifetime.
The OT redeemed at the Cross were presented to God into that heavenly kingdom when they physically ascended on Sunday morning after Jesus told Mary that He was about to ascend to God. John 10:17
"Jesus saith unto her, Touch me not; for I am not yet ascended to my Father: but go to my brethren, and say unto them, I ascend unto my Father, and your Father; and to my God, and your God."
These were the firstfruits of that Kingdom of heaven presented because of the Cross, and made alive in Christ per 1 Corinthians 15.
The Kingdom of heaven has been ongoing for 2500 years. Your verse will happen over a thousand years from now.
"Then cometh the end, when he shall have delivered up the kingdom to God, even the Father; when he shall have put down all rule and all authority and power."
The end is after Jesus has had an earthly kingdom from Jerusalem. That earthly kingdom is after the Second Coming, and after the final harvest of Matthew 13. The removal of all things offensive is concerning the preparation for the Kingdom of Messiah the Prince in Daniel 9.
The Kingdom of heaven is like the one Jesus will Himself reign over on the earth. Or in other words: the future earthly Kingdom will be free of sin and death like the heavenly kingdom of God, that started 500 years prior to Jesus' death, burial, and resurrection.
There is nothing to offend existing in heaven, but the church on earth has impersonators. They are called wolves in sheep's clothing. They would include the scribes and Pharasees in the first century who were preventing the lost from coming to the knowledge of the heavenly kingdom.
They were the ones Jesus described in parables as unjust stewards leading people astray, killing the prophets, and eventually killing even the Son of the heavenly Father.
So any attack, even by humans against God's will being done on the earth is attacking the kingdom of God. Not that they can attack heaven, but they can prevent people from coming to the saving knowledge of the Gospel, including changing the terms of the OT Covenant for human gain, instead of obedience to God. Today it would be any individual who changes the Gospel into something the Gospel is not.