We as Hindus(vedic knowledge) know that god is one and the variety in Hinduism are different representation of god him/her/it self.
Same is the concept of Christianity the holy trinity is one god.Jesus himself claims that "me and father are one and the same" also he claims that "no one gets to father except through him" (my understanding is that he said this in the context where the people of Israel were seeking God but the religion at that time was already corrupt so he points out the message he carries is the only way since bible also claims he is the word itself).
Both Christianity and Hindu concepts are same but divided by the saviour's names , in Christianity we need to be born again through spirit (realize that you have a holy spirit to guide you), similarly in Hinduism we attain eternity by realizing our true nature (born again - changing our ways of thinking by realizing our soul and paramathma).
There are many other places where i find similarities. Some verses are read out of context and gives different meaning and misleads many.
Every thing sounds similar but different saviour,s even if they are reincarnation of one God without God's motive nothing happens so why there is division in religions are we prepared for something?