But what is the role of Shakyamuni in Pure Land rituals?
As far as I have known all these years, in the Chinese Mahayana Trad and specifically in Pure Land, a Mahayana Dharma Door, Sakyamuni Buddha is highly regarded and honored, after all, Amitabha Buddha was made known by Sakyamuni Buddha, without the former, the latter would remain unknown to us. He is praised as the original or fundamental teacher and in fact in Sutra chanting, in the opening invocation, sung thrice: 'Namo Original/Fundamental Teacher Sakyamuni Buddha' and in temples where the traditional morning liturgy is followed, there is a praise to Sakyamuni Buddha and His Name recited while doing circumambulations.
Do they chant praises of Shakyamuni or do they only chant Amitabha's name?
Of course but it also depends on the temple and chosen liturgy format.
In most cases, it's either a combined thingy or just one.
E.g In one of the Chinese Mahayana liturgy, they have sung bowing repentances using Buddhas & Bodhisattvas names...a 'typical' one would be....
Namo Original/Fundamental Teacher Sakyamuni Buddha (thrice bowing)
Namo Amitabha Buddha (12 times bowing)
Namo Avalokitesvara Bodhisattva (thrice bowing)
Namo Mahastamaprapta Bodhisattva (thrice bowing)
Namo Great Clear and Pure Ocean Assembly of Bodhisattvas (thrice bowing)
Even so, the format above is from one temple and may differ in yet others in terms of number of bowing times and so on.
In another Pure Land Morning Liturgy: (quoted in excerpts as an example)
After the part of singing verses in making offerings, comes the bowing part:
'I now single-mindedly bow to our Original Teacher Sakyamuni Buddha, the Greatly Kind and Compassionate Teaching Host of humans and gods of the Saha World.' (bow & half bow)
(Kneeling, recite the following)
I, disciple (your name) repent with utmost sincerity, universally for the sake of the four benefactors, those in the three existences and all beings of the Dharma Realm:
(Sung bowing repentance)
All unwholesome karma committed in the past, (bow & rise)
From greed, hatred and ignorance of time immemorial, (bow & rise)
Arising from Body, Speech and Mind, (bow & rise)
Now do I repent and reform it all. (bow & rise)
Offenses arising from the Mind, Repentance is thus by the Mind, (bow & rise)
When Mind is eradicated, Offenses are abandoned, (bow & rise)
Mind abandoned, Offenses eliminated, both Empty,(bow & rise)
Thus is True Repentance and Reform.(bow & rise)
(Contemplation verse while bowing:)
The worshipped and worshipper are empty and still in nature,
The Response and the Way are intertwined inconceivably,
This Way Place of mine is like a wish fulfilling pearl,
Sakyamuni Buddha manifests in it,
I manifest before Sakyamuni Buddha,
Bowing down, I return my life in worship.
(Then starts the rest of the liturgy with bowing to Amitabha Buddha and the Hosts of Sukhavati...)
Does every Pure Land temple have a statue of Shakyamuni Buddha?
A bit of stuff here...
Firstly, as I have read and heard, in the Chinese Mahayana Trad, when one hears of a 'Pure Land temple', technically, there is no 'Pure Land lineage' strictly speaking, although the Pure Land Dharma Door of Amitabha Buddha and His Sukhavati started with this Dharma being imported from the Gandhāra region to China as early as 147 CE, when the Kushan monk Lokakṣema started Sutra translation work in China, especially when the 'Threefold Pure Land Sutras' were made available in the Chinese language.
It was the Ven Master Hui Yuan who founded the 'White Lotus Society' on Mt Lushan in Jiangxi Province in 402 CE, promoted & popularised the Pure Land Dharma Door in China, was posthumously named and recognised as the 'First Patriarch' and succeeded later by others (some of the 13 Pure Land Patriarchs are actual Ch'an Masters who found their affinity with Pure Land teaching, practice and realization & became leaders in teaching and promoting the Pure Land Dharma to others).
So, these 'Pure Land temples' are actually from the Ch'an lineages (mainly those of the Linji, Caodong and Guiyang Schools although there is another opinion stating 'Ch'an lineages' vs Tian Tai, but that's another story).
Even the famed Pure Land Master in our times, whom some regard him as the 14th Pure Land Patriarch Master, the Ven Master Chin Kung, was ordained in a Linji Ch'an temple in Yuanshan, Taipei, promoted the Pure Land Dharma vigorously all over the world. See here
And they may be of 4 types:
-exclusively dedicated to the Amitabha Buddha & His Sukhavati practice or
-those that promote dual practice: combining Ch'an and Pure Land, which is a common feature then and now or
-those exclusively Ch'an but they use recitation of Amitabha Buddha or any other Buddha/Bodhisattva only as a matter of liturgy and as a koan practice.
-those that have great facilities, space, availability of resources and openness: all of the above.
Secondly, there's also the other 'Pure Land' practices where one practices to seek rebirth in other Pure Lands other than Amitabha's like the Eastern Pure Land of Bhaisajya-Guru or Avalokitesvara's or Maitreya's and etc...although may not be as popular as devotion to Amitabha and His Sukhavati.
Thirdly, no hard and fast rules and it varies according to temple preference, budget, space and a host of other factors. Most temples in the Chinese Mahayana Trad would have His Image, if not in the shrine hall, it may be in other halls, displayed prominently. There's one Caodong Ch'an temple I know in my country, with Avalokitesvara Bodhisattva as the main Host and named after Him, and they are known to promote the dual practice of Ch'an and Pure Land, displays in their main reception/lecture hall (although not the main shrine hall) a huge statue of the reclining Sakyamuni Buddha flanked by Manjusri and Samantabhadra Bodhisattvas on the left and right.
Some examples I have seen are...(and there are other endless combinations, not limited to ones below)Ananda-Sakyamuni-Mahakasyapa
I have seen even in those specially dedicated to only Amitabha Buddha and His Pure Land practice, have the arrangement as follows: (can be statue or painted image)Sakyamuni Buddha (centre)
Mahastamaprapta Bodhisattva-Amitabha Buddha-Avalokitesvara Bodhisattva