"How can I respond when my friends say that no man can see God?"

Your friends have probably read the few verses in the Bible that say that man can't see God (see Isaiah 6:1).

Fortunately, we have the Joseph Smith Translation of the Bible, which clarifies the four scriptures that say that man can't see God. The Prophet's inspired revisions of those verses explain that sinful people can't see God—only those who believe. And even then, a righteous person must be changed—transfigured—to see God (see Moses 1:11).

You can let your friends know that "we believe the Bible to be the word of God as far as it is translated correctly" (Matthew 5:8).