An instructor at a public community college in Fresno has been improperly presenting his religious views on homosexuality, abortion and global warming as fact to students in an introductory health science class, the American Civil Liberties Union alleged Monday.

ACLU staff attorney Elizabeth Gill said at least two students at Fresno City College have complained that instructor Bradley Lopez quoted the Bible as proof that human life begins at conception, characterized homosexuality as a mental illness, and discussed apocalyptic Christian prophesies during a lesson on climate change.

If the students' descriptions are correct, Lopez's teaching methods would violate California laws protecting gays from discrimination and prohibiting religious indoctrination at public schools, Gill said. She sent a letter to college president Cynthia Azaria on Monday asking the school "to act immediately to ensure that all its health classes provide only accurate and unbiased information."

A telephone call and e-mail to Lopez and a telephone call to a college spokeswoman were not immediately returned.

Lopez is one of several Fresno City College instructors who teach the Health Science I course, which the college catalog describes as a survey of "contemporary science concepts and medical information designed to promote health." Topics covered in the course include sexuality, nutrition, substance abuse, physical fitness and heredity.

"Someone should realize you can't have a class like this presenting deeply held, and I'm sure honestly held, religious views as science," Gill said. "This is not a situation where people are taking a seminar on religion. Folks taking this class think they are getting Health Basics 101."

Jacqueline Mahaffey, 24, who had Lopez as a teacher last semester, said his personal beliefs became apparent on the first day of class when he made a point of contradicting their textbook, which listed cancer as the leading cause of death. Lopez told the class that abortions killed more people than cancer.

During the second week, Lopez allegedly gave the students a genetics assignment that involved studying the Bible to research Jesus Christ's biological makeup. He also told students that "evolution is a dead theory" and invited them to visit him in his office "if you want to know about your Creator."

Mahaffey said she and another student filed complaints with Lopez's dean about halfway through the semester following a lecture in which he said that sexual behavior involving less than 5 percent of the population should be classified as a mental disorder and that homosexuality "degrades" society.

"He (Lopez) sent a letter back to me denying he had ever said any of those things," Mahaffey said. "He said he never posted information about his religious status or position on homosexuals or anything like that, which struck me as a flagrant lie."

Mahaffey said she nonetheless stayed in the class and earned an A.

Gill said that as a college instructor, Lopez is free to express his opinions but that because Fresno City College is publicly funded, his teaching cannot become "religious inculcation."