People worship various deities, aspiring the rewards of rituals. In the human world, fruition of such piecemeal worship is easily had.
One takes to worshipping a deity, not because the deity has asked him to do so. Human mind is crazy to foster desires and have them fulfilled somehow. In the passion for it, the mind lands on some means, which promises to get what one looks for. This is how people turn to Devatas (deities), worshipping whom is said to fulfil their desires fast, though none can verify this prospect.
The better course is obviously to introspect and identify the impurities of the mind and strive to redress them. To have a sterling mind may be hard, and so none speaks about it. To get proper guidance in the matter is also not easy.
As against this, ritualistic performance is a short-term endeavour. It makes one free to indulge in sensory enjoyments. So, finding it easier, people prefer rituals to the self-purifying pursuit. A pitiable plight, no doubt, but many frantically go in for it!