Complex sentence: The knowledge that one's life is in accordance with God is necessary for obtaining eternal life, and any religion that does not require the sacrifice of all worldly things, does not have the power to produce the faith necessary for life and salvation.
Split into simpler sentences: The knowledge that one's life is in accordance with God's will is necessary for obtaining eternal life. Any religion that does not require the sacrifice of all worldly things, does not have the power to produce the faith necessary for life and salvation.