Our gods do not need to depend on such things to prove themselves, they exist and help us, only your Allah need to prove Himself through writing His name
This is a very illogical claim by those who believe in existence of many gods. Since their imaginary gods cannot practically write their names through nature by taking away control from Allah therefore they feel helpless and make such claim as an execuse to hide the fact that they are feeling defeated and their imaginary gods don't really exist to support their false beliefs.
Christians have shown a cross, or Hindus have shown their mark
Sign of cross, symbol or shapes are not the established names of gods of non-Muslims in their established religions at all. They should not show cross, symbols, shapes or random signs or any other forms but MUST show only the established names of their religious gods (e.g. Jesus Christ, Ezra, Yahweh, Rama, Krishna, Vishnu, etc) written naturally through nature by their own powers and control if they're truthful.
Allah is the established name of God in religion Islam and Tree of Allah is clearly visible in Arabic: للہ
Since there is no God except Allah, so no non-Muslim can ever prove that the names of their gods are written naturally through nature by their own powers and control which is why this tree is 100% physical and miraculous proof of the truthfulness of Allah's existence and truth of religion of Islam and last prophethood of Prophet Muhammadﷺ on whom the Holy Quran was revealed 1400 years ago.
If this proves to be true, then non-Muslims can show many such things
Not many "such things", non-Muslims should show their clear solid physical proofs to prove that their religious gods, by their own power, changed the laws of nature in the real human world through clouds, cows, dogs, cats, lions, birds, newborn babies, including other neutral creatures like lightning strikes and the earth, by writing down their names and also controlling them to call upon their names out of their mouths, because Allah has practically done it all through nature in the 21st century.
Our gods are more powerful than Allah
If there are gods beside Allah who created this universe and are really powerful than Allah then they all should gather on this tree and utilize all their powers to transform name of Allah اللہ into their names (e.g. Jesus Christ, Ezra, Yahweh, Rama, Krishna, Vishnu, etc) to defeat Allah in real world if they are gods.
They will never be able to transform this tree into their names by performing any miracle because all powers belong to Almighty Allah Wahid Al Qahar - The Creator of universe and God of Nature.
There is no Allah
If there is no Allah then how did Allah practically demonstrated His name through this tree in Pakistan and has shown His power and control through nature without any human intervention?
This is fake, illusion or magic
There is no non-Muslim in the world who can challenge this tree in any court of the world and prove it fake, illusion or magic because this is a miraculous tree made by Allah اللہ
So, it is absolutely and perfectly 100% reality of the 21st century and indeed also an observable, practical and demonstrateable proof on existence of Allah because there is not even a single tree in the world with naturally written name of imaginary gods of non-Muslims, so why not?
If you still consider it 100% fake and you have firm belief that this is an illusion then go ahead against this "Tree of Allah" and file a case in any court of the world to prove it wrong, can you do it?
If yes, then go ahead.
If no, then why you cannot?