Houston: John McCain's Phoenix pastor, Dan Yeary, is a folksy patriotic Southern Baptist who opposes abortion and believes homosexuality to be a biblical sin, but says Christians have an obligation to love such sinners.

That puts Yeary, who heads the church attended for the past 15 years by the US Republican presidential candidate firmly in the US Southern Baptist mainstream, and in line with the Republican Party.

He offers a sharp contrast to Democratic contender Barack Obama's former preacher Jeremiah Wright, who has stirred controversy with his fiery comments on race and America.

Obama had been seen by some analysts as having an edge over McCain on issues of faith because of his adult conversion experience and his ease in talking about his faith. But his own preacher has proven a political liability. In a country where religion and politics often mix, 25 per cent of American adults count themselves as evangelical Christians, giving them huge influence as the country heads to the November 4 presidential election to succeed President George W. Bush.

McCain draws some support from this group but many conservative Christians are uneasy with him because of his support for stem-cell research and his past criticism of leaders in the movement.

Yeary, pastor for the 7,000-member North Phoenix Baptist Church, professes little interest in politics and prefers to focus on preaching and spiritual guidance. But McCain's affiliation with Yeary will do him no harm in wooing support from the key Republican base of evangelical Christians.