Does Phyrexian mana count toward devotion?

Devotion counts the number of colored mana symbols in the mana costs of permanents you control (CR 700.5). A Phyrexian mana symbol such as {G/P} is a hybrid symbol that represents either one green mana or 2 life. Crucially, it is still a green colored mana symbol printed in the card's mana cost.

CR 202.2c states that a Phyrexian mana symbol is a colored symbol for the purpose of determining a card's color and for other rules that reference colored mana symbols. Because devotion explicitly looks at colored mana symbols in mana costs (CR 700.5), a Phyrexian mana symbol contributes one pip of its associated color to devotion.

For example, if you control Birthing Pod (mana cost {3}{G/P}), it contributes one green pip to your devotion to green, even though you might have paid 2 life instead of {G} when you cast it. What you paid is irrelevant; only the printed mana cost matters.

Similarly, a card with {W/P}{W/P} in its cost contributes two white pips to devotion to white. The key principle is that devotion checks the mana cost as printed on the card, not how it was paid.