Christ rose on the third day and He lives and loves all of us now as much, or even more, then He ever has. He continues to influence our lives through His spirit. He continues to tech us through his called and set apart leaders. Christ was on this earth for roughly 30 years, this time period is known as His earthly ministry. The bible, His own words, other written scripture, and continuing revelation tell us that His earthly ministry was a very small fraction of His infinite ministry.
No the buildings belonging to The Church of Jesus Christ of Latter-day Saints do not display crosses, but every structure from the smallest meetinghouse to the largest Temple has ornamentation that prompt the eye to look upward, upward to heaven, upward to Christ, upward to the eternity that is future.