How does one instill religious traditions in their child?

Kids pick up everything they see a home so if u are a religious family, ur kid will absorb some of it naturally. In our case, we are atheists. My kids do not believe in God or any religion. However, my elder one knows about all religions and respects them all, and also respects the religious sentiments of others. Even though we do not practice any religion we do celebrate most festivals from various religions. I believe ur child will learn best when u make it seem natural and not forced upon.