in hinduism,salvation is for every living being including human beings,birds,animals,reptiles, marine living creatures.example bird jadayu in ramayanma, lord ram granted moksha to this bird for fighting adharmic ravana.hence we treat all other living creatures with love and affection as due to bad karma,animals,birds have taken this janma.all above are knowledble in the sense they protect their interest.christianity has no answer to the salvation for trees,animals,birds ect but believe salvation which is one time affair for them either to hell or heaven permanent.hence in the absense of re-birth and karma,they can not explain about inequality of living beings- say different race,shape,colour, rich/poor,educated/uneducated,goodhealth/bad health ect.suddent death/natural death ect.only in hinduism we can have answer.old timer christians have now realised this and never attend churches nowadays and hence drop of church goers in west and also in cities in india
