Your uncle was probably mentally unbalanced, Ironic how he went insane but not a single Mahapurkh did despite many of them doing a large variety of prayers. Yoga is not a part of Sikhi, full stop, you'll never reach god in kalyug with it, if you're lucky you'll get into a higher mind state but you will never reach god without Satguru Nanak.
Honestly maybe you should some time with your uncle in a mental institute, maybe that will cure you of whatever myopic way of thinking lead you to such stupid conclusions.
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