Bhagavad Gita Chapter 9, Verse 23

येऽप्यन्यदेवताभक्ता यजन्ते श्रद्धयान्विताः | तेऽपि मामेव कौन्तेय यजन्त्यविधिपूर्वकम् ||

ye 'py anya-devatā-bhaktā yajante śraddhayānvitāḥ te 'pi mām eva kaunteya yajanty avidhi-pūrvakam

Even those who, endowed with faith, worship other gods, worship Me alone, O Arjuna, though in an improper way.

Krishna reveals the Supreme's inclusivity: 'Ye 'py anya-devatā-bhaktā yajante śraddhayānvitāḥ'—even (api) those (ye) who are devotees of other gods (anya-devatā-bhaktāḥ), endowed with (anvitāḥ) faith (śraddhayā), worship (yajante). 'Te 'pi mām eva kaunteya yajanty avidhi-pūrvakam'—they (te api), O Arjuna (kaunteya), worship (yajanti) Me alone (mām eva), though in an improper way (avidhi-pūrvakam). This reveals the Supreme's all-pervasiveness: all worship reaches Him, even if done to other gods. Those who worship other gods with faith are actually worshiping the Supreme, but in an improper way. They don't know it's the Supreme—they think they're worshiping other gods. But the Supreme accepts all worship—it all reaches Him. This is the Supreme's compassion: He accepts all worship, even if done improperly. This is why devotion to the Supreme is superior: it's direct, not indirect.