Do Christians believe in eternal life?

I don't know who lied to you, but Mary is NOT dead, nor are any of the saints in heaven. And we do not pray to her, rather, we ask her to pray with us to God the father, like a prayer partner, so to speak. We DO believe that Christ conquered death at the cross, and by his stripes are we saved! We do believe that eternal life was won for us at the cross, and is granted to all who come to Christ. I would be happy to discuss more about Christianity with you. Email me.