Simplify the following text for a Grade 10 native English-speaking person.
Original: Most Christian groups use or have used art to some extent , although some have had strong objections to some forms of religious image , and there have been major periods of iconoclasm within Christianity .
Simplified: Most Christian groups and denominations either use or have used art to some extent . Other sects , however , have do not like the idea of religious image , and there have been major periods of iconoclasm within Christianity .