What is the difference between Pilates and Yoga?

I am looking for a non-fussy exercise that I can do at home. I would like to sweat a little from it, but the main thing is that I exercise my muscles safely (not interested in muscle building). I have tried a little bit of yoga, and I really liked how I felt afterwards. I really like the stretching, and breathing aspects. But, I am a Christian, and the spiritual aspect of yoga;the fact that it’s leaning toward Eastern religion, bothers me (no offense to those who believe it). Thanks for your answers!

Related posts:

1. What’s the difference between yoga and pilates?
2. What is the difference between yoga and pilates?
3. What are the beneficial differences between yoga and pilates?
4. What specific things will pilates and yoga do for my body?
5. Where can I find free pictures or diagrams of yoga and pilates positions?