Believe in Peace

This sticker incorporates various religious symbols.

 The "P" incorporates the Christian cross. 

The "e" incorporates Albert Einstein's equation that expresses the equivalence between Energy (E) and Mass (m),   in direct proportion to the square of light in a vacuum (c²). This equation is not really a religious symbol, but in this context, it might be said to symbolize the scientific world-view. 

The letter "A" is represented by the Star of David, also known as the Shield of David. The symbol has been used since about A.D. 1000 to symbolize Judaism and the Jewish community. The symbol appears on the Israeli flag. Read more about the Star of David on Wikipedia.

The "C" is represented by a crescent moon and star, commonly used to represent Islam.  However, the symbol was in use for thousands of years before it was ever associated with Islam. Here is what it says on About.com about these symbols: "Most sources agree that these ancient celestial symbols were in use by the peoples of Central Asia and Siberia in their worship of sun, moon and sky gods. There are also reports that the crescent moon and star were used to represent the Carthaginian goddess Tanit or the Greek goddess Diana."

The symbol used at the end instead of the letter "e" is called an "Omkar". It has been modified to incorporate a peace symbol. The "Omkar" represents the Sanskrit word for "Om"  According to About.com, Om is "the primordial sound by which the earth was created -- a similar concept to the Greek Logos. It symbolizes unfolding or expansion." The Omkar has four parts representing the four states of human consciousness: ordinary wakefulness, deep sleep, dreaming, and absolute conscience.

I am not sure about the significance of the 9-pointed star used to dot the exclamation point. Bahai's sometimes use this symbol to represent the number "9", though it is not necessarily a Bahai symbol. I have seen it listed among Christian symbols, though I don't know if the listing was accurate. 

There are nine small religious symbols at the bottom of this sticker:

Yin-Yang

Dharmacakra

The third symbol appears to be a round circle with flames inside. A three-fingered hand appears to overlap the flames. 

Kokopelli

Zia

Khanda

Jain Hand

Pentacle ?

Flaming Chalice