You're the teacher!
Those who planned the scope and sequence of The Gospel Project for Kids and those who are writing it keep the goals for the three-year curriculum foremost in mind as they work. Wording is carefully chosen to reinforce the plan for each session and to be biblically accurate.
You probably express yourself differently from the words in the session, so of course you may teach using your own words. Use the lesson to help your conversation stay on track. If you feel more comfortable using the words as written, give them life by making eye contact with kids as you teach and converse.
If you enjoy planning different activities from those suggested, that’s fine. You might like to include more cooking, carpentry, musical instruments, messy art, games, photography, video, or multiweek projects, for example. The main thing is to use every activity as a springboard for talking about some aspect of the Bible story, Big Picture Question, or Christ Connection. Remember: “What makes church different from daycare is the biblical content. … If all the child learns is how to work with art materials, he has not been to church.”*
You know the children in your class and their families, the supplies and furniture available at your church, the schedule you have to work with, and the teachers on your team. You have your own personality, experience, and things you find fascinating. Your session will be different from another teacher’s session. The curriculum is a guideline to help you out. You are the teacher.
* (Quotation—thanks to Yvonne Tomlinson)