Mahayana and Tibetan Buddhism developed more than 600 years and 1000 years respectively after Buddha. so they contain a lot of teachings which deviate from the original teaching of Buddha. Sad to see later practices deteriorate into superstition, relaxation of monks precepts, tantric, mantras etc. This greatly deviate from the cultivation of virtue, deep meditation and insight wisdom found in the original teachings. Cheers.
Modern research on Near Death Experience by Raymond moody, reincarnation memories by Ian Stevenson/Jim trucker and past lives regression by Brian Weiss all independently but coincidentally show that our consciousness survive death, we live many lives and our thoughts and actions matter in the hereafter. This is in line with Buddhist teachings. So be kind and helpful to others, be virtuous, meditate and cultivate ourselves to higher spiritual levels. Cheers.