"It's a constant challenge for the church to challenge culture and not just absolve it. The church must engage in social change and social justice, not just engage in a ceremony.
"Many churches are not actively involved in bringing about equal opportunity, even among their own churches. When the church convenes to come up with a plan for racial justice and gender equality and workers' rights, that is the church at its best."
Rev Jackson also acknowledged the problem of gun and gang crime dogging the UK's major cities, and called for greater investment in the worst affected areas.
"They don't manufacture guns in the inner city. They don't manufacture drugs in the inner city. We must stop the flow of guns and drugs in and stop the flow of jobs and investment out," he stressed, adding, "We treat the poor poorly and differently. We must raise the expectations of human rights for people who are poor."
Rev Jackson also dug his heals into the Iraq war, telling Christian Today that it was based on a "made-to-manufacture threat", and that Saddam Hussein was "contained" and therefore not a threat to Iraq's neighbours or to Europe at the time of the invasion by the US-UK led coalition forces in 2003.
"Here we used global power in a way that is bringing about a global catastrophe. We are losing lives, money, honour and moral authority," he said. "Since we engaged in that kind of war in Iraq, Iran is becoming a greater threat, Afghanistan is in real crisis and Pakistan is in an even greater crisis. By losing our moral authority we are unravelling our capacity to resolve conflict."
Later on in the day, Rev Jackson took part in a meeting, also organised by Churches Together in Britain and Ireland, in which he delivered an address to black grassroots activists and partners called "Entitled to excellence - inspiring future generations of black Christian leaders in church and society".
During the meeting, Rev Jackson stressed the need for black people to have fair access to education in order to achieve equality in society.
"Those who are educated are going to lead the rest of us," he said, adding, "Strong minds break strong chains. We shouldn't have grasshopper complexes and die with low expectations."
Rev Jackson began his visit to the UK with a sermon at the American Church in Central London, and before heading to Oxford on Tuesday. On Wednesday, he will lecture on freedom and education within the context of the 200th anniversary of the Abolition of the Slave Trade Act by the British Parliament, and take part in a ceremony to become an Honorary Fellow of Regent's Park College.
Rev Jackson's latest visit to the UK follows a 10-city tour of England during the summer, which included stops at London, Manchester and Liverpool.
