Just be as open and honest with them as you can, short of revealing the secrets. I would even try to set up an open meeting with an open invitation to any and all church member that wish to attend. Remind them that this country was founded on the ideals of Freedom and Tolerance, which are Founding Fathers learned about in their Masonic Lodges during a time of intolerance and the rule of monarchs.
But whatever you do, don't try to dodge a question. If they ask you about the secrets, just tell them that they are ancient forms of recogniations that you took an oath on your honor not to reveal. And as for them being a secret, they've been published by various people who lied to gain them for the last 300+ years.
If they ask about Masonry being a religion, tell them the truth in that Masonry has never tried to be a religion, but encourages all of it's members to be steadfast in their chosen faith.
And my favorite, if someone brings up Masons trying to take over the world tell them this. During the Revolutionary War, the Continential Congress was set up like the Masonic Grand Lodge system, because that's what the Founding Fathers modelled us after. Our Constitution, especially the Bill of Rights, came from Anderson's Constitution, which was the constitution that governed Masonic Lodges at the time. America's most famous Mason was George Washington. Following the Revolution, many statesmen wanted to make George Washington King of America, which he turned done. He was offered the chance to be President for Life, which he also turned down. The section of the Constitution outlining the job of the President was written with a lot of input by George Washington. So George Washington, America's most famous Mason, turned down the chance to be king and turned down the chance to be President for life. After serving his second term, despite still overwelming popularity, he stepped down from the office of President setting a tradition of a 2 term limit. The 22nd Amendment that limits a person to 2 Presidental terms was added to the Constitution in 1947 by President Harry Truman, who was also a Mason. So to say that Masons are trying to take over the world is incorrect. History shows that Masons have been continuelly offered the world, and we gave it to the people.