an initiatory move towards open dialogue between the groups. Some evangelicals criticized Zacharias' decision not to use this opportunity to directly address the "deep and foundational" differences between the traditional Christian faith and the teachings of the LDS Church. He responded by asserting that Christians should not immediately condemn so-called the LDS Church's theological differences but "graciously build one step at a time in communicating our faith with clarity and conviction", stating that this would be just as effective as showing someone the faults of their faith. The speaking engagement was nearly sabotaged by an allegation by event organizer Greg Johnson, president of Standing Together, that Zacharias had nothing to do with editing the book The Kingdom of the Cults and had only loaned his name to the latest edition; Johnson later apologized for his comment. Zacharias was a frequent keynote lecturer within the evangelical community at events including the Future of Truth conference in 2004, the National Religious Broadcasters' Convention and Exposition in 2005, and the National Conference on Christian Apologetics in 2006. On successive nights in October 2007, he addressed first the students and faculty of Virginia Tech, then the community of Blacksburg, Virginia, on the topic of evil and suffering in the wake of the Virginia Tech massacre. Zacharias represented the evangelical community at occasions such as the National Day of Prayer in Washington, D.C., the Annual Prayer Breakfast at the United Nations, the African Union Prayer Breakfast in Maputo, Mozambique, and was named honorary chairman of the 2008 National Day of Prayer task force. He also participated in the ecumenical Together 2016 meetings, which Pope Francis addressed, describing the event as a valiant effort. In 2006, Ravi Zacharias along with Wycliffe Hall established the Oxford Centre for Christian Apologetics (OCCA) in Oxfordshire, England though it is now entirely separate from Wycliffe. In November 2009, Zacharias signed the ecumenical Manhattan Declaration which affirms the sanctity of human life, the dignity of marriage as a union of husband and wife, and freedom of religion as foundational principles of justice and the common good. In 2016, Republican presidential candidate Marco Rubio appointed Zacharias to his anti-abortion "Dignity of Life" advisory panel. In 2015, according to RZIM's public Form 990 tax return, Zacharias and his wife earned a combined total of $523,926 from the ministry. Worldview Zacharias argued that a coherent worldview must be able to satisfactorily answer four questions: