Siddhis only occur in people/minds with an underlying disposition for siddhis. For example, the famous arahant disciple & jhana master Sariputta did not have siddhis.
Enemies of the Buddha, such as Mara & Devadatta, had siddhis. Christians & Hindus have siddhis.
Siddhis are a supernormal yet mundane worldly phenomena, unrelated to Buddhist enlightenment (refer to Susīma Sutta & Kevatta Sutta).
There are enough Buddhists & Christians that have siddhis. If you look for them or pray for them, you might find them. Or if you practise seriously in monasteries & other serious places, you might meet them. The Attavagga states such people cannot purify your mind.
Generally, people with siddhis control their devotees, who relate to/worship them like gods. In the Kevatta Sutta, it is taught the greatest miracle is that of 'instruction' to Nibbana rather than siddhis.