That's not necessarily true.
The worlds main religions (Christianity, Judaism and Islam) all believe in the same God but just have a different way of worshipping it. Christians believe Jesus was the son of God whereas Jews simply believe Jesus to be a prophet to deliver a message from God and Muslims believe that Mohammed was a prophet to deliver a message from God.
Even if the Christian ideas may be the correct ones, surely God won't overlook other vcways people are devoting their lives to worshipping him because all the major religion books teach that our God is a fair and just God and I think it's unlikelyt that he will punish people who worship just because of being born into a certain family.
ps - I don't know what will happen to Buddha's, Pagans, Hindu's e.t.c