Did it take 4.5 billion pounds of thurst to bring the Apollo 11 home?

No, it did not take 4.5 billion pounds of thrust to bring Apollo 11 home. The spacecraft's return to Earth involved a controlled descent using its service module's engines and atmospheric re-entry, rather than requiring such an immense amount of thrust. In fact, the spacecraft's Command Module had a relatively small engine for its re-entry and landing phase. The total thrust needed for launch and travel to the Moon was much greater, but the return involved different dynamics.